Welcome to DSMtuners - the largest Mitsubishi Eclipse, Eagle Talon, 4G63t and 420A DSM performance resource on the web



















Login



Go Back   DSMtuners > DSM Forums > General > Newbie Forum
Welcome to DSMtuners - the largest Mitsubishi Eclipse, Eagle Talon, 4G63t and 420A DSM performance resource
You are browsing the site as a GUEST. Please login (or register) and gain the ability to post on our site and interact with other DSMers. You also get to browse the site with fewer advertisements. It is FREE to join!

Newbie Forum: Beginner/newbie/general DSM modification questions. First mods, how to run 10's when you haven't run 12's yet, any tech question that doesn't fit in another tech forum. Probationary Members must limit their tech posts to this forum and sub-forums.

Reply
 
LinkBack   Thread Tools
Old 03-08-2010, 04:36 PM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #1 (permalink)
Proven Member
 

randizzle420's Avatar
Registered: Sep 2009
Tech Posts: 89
Classifieds Rating: 0
Reputation: randizzle420 is an unknown

Alternator works but it won't charge the battery..


I just bought a new battery, and it kept going dead when I was driving it. I was pretty positive it was the alternator because I tested the battery when the car was on, and it was only 12 volts. I took the alternator off, took it to pep boys, they tested it, and the alternator is fine, was putting out 14. something volts. Any ideas what the problem might be?


mark post as helpful recommend reputation points    Reply With Quote
Old 03-08-2010, 04:48 PM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #2 (permalink)
Proven Member
 

etay89's Avatar
Car: 08 Evolution GSR
Registered: Dec 2009
Tech Posts: 398
Photos: 11
Classifieds Rating: 37
Reputation: etay89 is an unknown
Send a message via AIM to etay89 Send a message via MSN to etay89 Send a message via Yahoo to etay89 Send a message via Skype™ to etay89
i was having a similar problem, except i have a new alternator AND battery. i never attempted to fix the problem, but my guess is probably wiring somewhere.

my car would have trouble turning over or whatever else in between, then i hooked up an air fuel controller and have it monitor my volts.

when you run electronics in the car (cigarette lighter, radio, turn signal, headlights, etc.) obviously it uses the battery power...but overdrawing power things (an amp, 55w silverstar headlights, holding on the brake at a long light, etc) drains power faster, dims light, and hurts performance

my advice to u if you are concerned is buy a cheap voltmeter, and monitor it yourself. wanna spend a bit more? get a voltage gauge or an air fuel controller.

*edit* also, try just driving it around constantly for about a half hour at high speeds (get on the highway and then turn around) to see if the alternator charges the battery. at off, the battery should be between 12.8-14.8. if it doesn't then you may need a new alternator.


____________________________
-Eric
'99 GS-TEX
View photos of this member's car 

mark post as helpful recommend reputation points    Reply With Quote
Old 03-08-2010, 05:08 PM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #3 (permalink)
Proven Member
 

randizzle420's Avatar
Registered: Sep 2009
Tech Posts: 89
Classifieds Rating: 0
Reputation: randizzle420 is an unknown
The battery is new and the alternator was just tested at pep boys and the alternator works. I did drive it on the highway and the battery died on me and I had to get my car towed.

mark post as helpful recommend reputation points    Reply With Quote
Old 03-08-2010, 05:13 PM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #4 (permalink)
Proven Member
 

tallywacker's Avatar
Registered: Dec 2002
Tech Posts: 347
Photos: 2
Classifieds Rating: 0
Reputation: tallywacker is more helpful than not
Send a message via AIM to tallywacker Send a message via Yahoo to tallywacker
I can't wait for mine to die again so I can do the Saturn alternator swap and not have to worry about it for a long time.


____________________________
'90 TSi FWD
View photos of this member's car 

mark post as helpful recommend reputation points    Reply With Quote
Old 03-08-2010, 05:34 PM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #5 (permalink)
Proven Member
 

etay89's Avatar
Car: 08 Evolution GSR
Registered: Dec 2009
Tech Posts: 398
Photos: 11
Classifieds Rating: 37
Reputation: etay89 is an unknown
Send a message via AIM to etay89 Send a message via MSN to etay89 Send a message via Yahoo to etay89 Send a message via Skype™ to etay89
something in your car is drawing alot of power to cause it to die. now if its dying while it's running but stopped...thats one thing. if it's dying while its moving, that's another. you probably have a short somewhere. check all alternator wiring, make sure the battery terminals are clean and that the negative is properly grounded.


____________________________
-Eric
'99 GS-TEX
View photos of this member's car 

mark post as helpful recommend reputation points    Reply With Quote
Old 03-09-2010, 06:14 PM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #6 (permalink)
Proven Member
 

randizzle420's Avatar
Registered: Sep 2009
Tech Posts: 89
Classifieds Rating: 0
Reputation: randizzle420 is an unknown
well I put a new ground in for the battery, cleaned the posts and everything. I'm still having the same problem with the battery not being charged by the alternator. The battery light just stays on in the car. Also, if I turn my headlights on then turn them to the off position the headlights stay on. Only way to get the headlights to turn off is to unplug the battery.

mark post as helpful recommend reputation points    Reply With Quote
Old 03-09-2010, 07:22 PM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #7 (permalink)
Proven Member
 

etay89's Avatar
Car: 08 Evolution GSR
Registered: Dec 2009
Tech Posts: 398
Photos: 11
Classifieds Rating: 37
Reputation: etay89 is an unknown
Send a message via AIM to etay89 Send a message via MSN to etay89 Send a message via Yahoo to etay89 Send a message via Skype™ to etay89
then you have some type of crazy wiring problem. i'd get it checked out


____________________________
-Eric
'99 GS-TEX
View photos of this member's car 

mark post as helpful recommend reputation points    Reply With Quote
Old 03-09-2010, 07:23 PM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #8 (permalink)
Proven Member
 

1995gsx20g's Avatar
Registered: Mar 2008
Tech Posts: 667
Classifieds Rating: 2
Reputation: 1995gsx20g is more helpful than not
to me it sounds like you have a problem with your voltage regulator within the alternator.
- the issue with your headlights could be when your alternator is putting out around 16v-18v the relays in your car like your headlight relays act very funny and do crazy things.

- i got a "rebuilt" alternator from a parts store and the voltage regulator was only charging 12.3v at idle but above that at around 2k and up it would act normal aka why pepboys thinks its good. but if you let your car idle for a few seconds it will drain your battery. so it will not start back up once you shut it off but if you hold the rpm at 2k for a few mins and shut it off at 2k then go to restart it, it will start up.

- like stated above your car shutting off WHILE driving sounds like a short or a poor ground that can be more than just at the battery. when it shuts off do you lose all power to accessories also?


____________________________
Chris
1995 Trannychewer, FWD
RIP Cornbread

mark post as helpful recommend reputation points    Reply With Quote
Old 03-09-2010, 08:22 PM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #9 (permalink)
Proven Member
 

91Bomb's Avatar
Registered: Jul 2003
Tech Posts: 589
Classifieds Rating: 16
Reputation: 91Bomb is more helpful than not
Aftermartet alts are known to have voltage regulators that don't work right with our cars or somethinhg to that effect. I put 3 pep-boys alts in my car in 2 mth period and have read many times about other dsm'ers doing the same thing with atouzone alts, advance, etc. Best bet is to get an oem alt and pm me if you want a good used oem mitsu alt cheap because I'm parting out one of my dsm's.

mark post as helpful recommend reputation points    Reply With Quote
Old 03-09-2010, 08:42 PM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #10 (permalink)
Proven Member
 

randizzle420's Avatar
Registered: Sep 2009
Tech Posts: 89
Classifieds Rating: 0
Reputation: randizzle420 is an unknown
I found the culprit! It was a bad alternator relay. I replaced it and now everything runs good.

mark post as helpful recommend reputation points    Reply With Quote
Old 03-09-2010, 08:56 PM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #11 (permalink)
Proven Member
 

spydreclips6's Avatar
Registered: Dec 2005
Tech Posts: 70
Classifieds Rating: 6
Reputation: spydreclips6 is an unknown
I know you took your alternator off and to pep boys to test it, but you should test it with it still in the car to figure out what your problem is. Use your multimeter (if you don't have one get one). Turn it to dc volts put your leads on your battery (with the car running), if your alternator is charging it should read from 13.5V-14.5V(thats a good charge). If your not getting a reading from there you can check your output from your alternator. Make sure you ground your multimeter, and put the power side to the stud that is coming out from the alternator(should be nut holding your wires that go to your battery). If your getting 13.5-14.5V there then the connection between the alternator, and battery is bad. Hope that helps!

mark post as helpful recommend reputation points    Reply With Quote
Old 03-09-2010, 10:15 PM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #12 (permalink)
Moderator
 

9!'clipseDOHC's Avatar
Registered: Aug 2003
Tech Posts: 3,447
Photos: 41
Classifieds Rating: 5
Reputation: You can trust this leader of the site
Quote:
Originally Posted by randizzle420 View Post
I found the culprit! It was a bad alternator relay. I replaced it and now everything runs good.
I was just reading through your post and thinking, sounds just like a blown ALT fuse. Glad you figured it out. Wish I'd seen your post earlier, I would have pointed you in the right direction. Good luck!

Also, don't forget to mark this thread as solved/resolved.
Visit 9!'clipseDOHC's homepage!  View photos of this member's car 

mark post as helpful recommend reputation points    Reply With Quote
Old 05-24-2010, 12:51 PM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #13 (permalink)
Proven Member
 

4g63t's Avatar
Car: 93 Talon TSI / EVO VIII
Registered: Aug 2005
Tech Posts: 735
Photos: 12
Classified Ads: 1
Classifieds Rating: 19
Reputation: 4g63t is more helpful than not
Send a message via MSN to 4g63t
So my alt spikes up to 17v to 18v for a few min at a time then it will run the normal 14.v. Would this be the alt relay too. It is a new alternator. Or would it be the voltage regulater is bad in my new alternater.


____________________________
-DSMolition-
MY1GDSM Tuned
Visit 4g63t's homepage!  View photos of this member's car 

mark post as helpful recommend reputation points    Reply With Quote
Old 05-24-2010, 02:52 PM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #14 (permalink)
Proven Member
 

Jarnutt's Avatar
Registered: Sep 2009
Tech Posts: 81
Photos: 3
Classifieds Rating: 2
Reputation: Jarnutt is an unknown
That's a bad regulator hands down. Sounds like its not regulating anything anymore and its sending full field voltage to it causing it to max out on the charge. Anything over 14.8 is abnormal usually, anything over 16 can start to eff up electronics, you'll be lucky if your ECU/TCU survive too many of those spikes
View photos of this member's car 

mark post as helpful recommend reputation points    Reply With Quote
Old 05-25-2010, 05:55 AM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #15 (permalink)
Proven Member
 

4g63t's Avatar
Car: 93 Talon TSI / EVO VIII
Registered: Aug 2005
Tech Posts: 735
Photos: 12
Classified Ads: 1
Classifieds Rating: 19
Reputation: 4g63t is more helpful than not
Send a message via MSN to 4g63t
Damn, o'well im going to take it out next time it does it. I just baught it so ill just return it for a diff one. (My power windows whoop ass at 18v lol)


____________________________
-DSMolition-
MY1GDSM Tuned
Visit 4g63t's homepage!  View photos of this member's car 

mark post as helpful recommend reputation points    Reply With Quote
Old 05-25-2010, 03:44 PM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #16 (permalink)
Proven Member
 

Jarnutt's Avatar
Registered: Sep 2009
Tech Posts: 81
Photos: 3
Classifieds Rating: 2
Reputation: Jarnutt is an unknown
Quote:
Originally Posted by 4g63t View Post
Damn, o'well im going to take it out next time it does it. I just baught it so ill just return it for a diff one. (My power windows whoop ass at 18v lol)
Lots of stuff woops ass at 18v, like a cordless drill .
Id get it taken out and swapped, voltage spikes are NEVER good.
View photos of this member's car 

mark post as helpful recommend reputation points    Reply With Quote
Old 05-25-2010, 09:15 PM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #17 (permalink)
Proven Member
 

Sandman817's Avatar
Registered: Mar 2010
Tech Posts: 285
Photos: 10
Classifieds Rating: 13
Reputation: Sandman817 is more helpful than not
Just for future reference, a quick easy way to check if an alternator's dioeds are bad is to get a Multimeter, put it on AC VOLTAGE. put a lead on each terminal while the car is running. If you get anything more than .5volts one or more of your diodes are going bad.

Diodes convert AC voltage to DC voltage which can be stored in your battery.
View photos of this member's car 

mark post as helpful recommend reputation points    Reply With Quote
Old 11-21-2010, 09:04 AM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #18 (permalink)
Probationary Member
 

Krueger84's Avatar
Registered: Jul 2010
Tech Posts: 8
Reputation: Krueger84 is an unknown

Help!


I have the same exact problem on my 1995 Tsi but I can't find where the alternator relay is on my car, can you please point me in the right direction. My car has been down for about 4 months now with this problem and I've replaced the alternator, battery and ecu. I would appreciate any help. Thanks in advance.

mark post as helpful recommend reputation points    Reply With Quote
Old 11-12-2012, 06:44 AM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #19 (permalink)
Probationary Member
 

NOTORIO3030's Avatar
Registered: Nov 2012
Tech Posts: 10
Photos: 7
Reputation: NOTORIO3030 is an unknown
Yeah my 95 tsi is not holding the charge at night when i turn the lights on so i cant race nobody at night because it starts missfiring at 20 psi
View photos of this member's car 

mark post as helpful recommend reputation points    Reply With Quote
Old 11-19-2012, 07:05 PM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #20 (permalink)
Proven Member
 

93 gsx skidz's Avatar
Registered: Sep 2012
Tech Posts: 43
Classifieds Rating: 0
Reputation: 93 gsx skidz is an unknown
I'm having kind of a similar problem. But my accessories and lights don't work. The car runs and starts up fine but the battery will die after running it for a while. I can't even roll up my windows. What do u think it is

mark post as helpful recommend reputation points    Reply With Quote
Reply

Bookmarks

Thread Tools

 

» Recent DSM Photo
» Current Poll
How many times have you been to the Shootout?
1 - 39.86%
167 Votes
2-5 - 41.77%
175 Votes
6-10 - 10.50%
44 Votes
11-15 - 3.10%
13 Votes
16-20 - 4.77%
20 Votes
Total Votes: 419
You may not vote on this poll.
» Online Users: 778
190 members and 588 guests
Most users ever online was 1,704, 03-17-2008 at 09:11 PM.
DSMtuners Main Sections
DSM Forums
DSM Regional Forums
DSM Builds/Journals
DSM Articles
DSM Tech Guides
DSM Upgrade Paths
DSM Parts Reviews
DSM Vendor Reviews

DSM Classifieds
DSM Parts Guides
DSM Photos
DSM Videos
DSM Timeslips
DSM Dyno Sheets
Shirts & Apparel
DSMtuners Decals

Advertising Info
Our Sponsors
Site Rules
Terms of Service
Privacy Policy
Site FAQ
About Us
Contact Us

© 2014 DSMtuners.com - All Rights Reserved

DSMtuners is not affiliated with Diamond Star Motors. The Mitsubishi Eclipse, Eagle Talon, Plymouth Laser, Mitsubishi Galant VR-4, and associated logos are trademarks of Diamond Star Motors, Mitsubishi Motors, and Chrysler Corporation. No, we do not hand out car sponsorships.

All times are GMT -7. The time now is 03:14 PM.


Vendor Tools vBulletin Plugins by Drive Thru Online, Inc.

Search Engine Optimization by vBSEO 3.6.0