The Top DSM Community on the Web

For 1990-1999 Mitsubishi Eclipse, Eagle Talon, Plymouth Laser, and Galant VR-4 Owners. Log in to remove most ads.

Please Support ExtremePSI
Please Support Fuel Injector Clinic

Resolved Battery draw. Please help me find it

This site may earn a commission from merchant
affiliate links, including eBay, Amazon, and others.

This site may earn a commission from merchant affiliate links, including eBay, Amazon, and others.

Chaotic94

Proven Member
177
3
Oct 5, 2013
West Plains, Missouri
Okay so if I leave my battery hooked up over night, its dead by morning. I traced the draw to the MPI fuse on the positive terminal. When I unhook that fuse, the draw goes away, according to my multi meter. Where can I start looking to see what's drawing power. What exactly does the MPI fuse give power to? Any help is greatly appreciated!
 
Okay I found the relay. I unhooked it and the draw went away. I then replaced it with a known good replacement and the draw came back just the same as before. Any ideas?
 
Okay so what I have going on here is my multimeter is in parallel between the negative post and the negative terminal for the battery. It is showing a draw of 1.67 when the multimeter is set on 20m(10a). When I unhook the MPI fuse, that draw drops to 0.0. Something to do with the MPI is draining my battery I assume.
 
I also have a test light if I need to test circuits that way. I'm just not great with electrical. Thanks again!
 
Okay I got the fuse out. There's still a draw/short somewhere. Instead of using a multimeter in parallel between the negative terminal and negative post, I used a test light and it lit up. So I'm looking for a short rather than a draw, correct?...
 
Thanks for the links! I'm already past that part though. I know the short is somewhere after the MPI fuse. Just gotta figure out where. If I remove the MPI fuse OR the MPP relay, the short goes away according to the test light. Just have to figure out where the short is on the MPI circuit
 
I've unhooked the fuel pump, maf sensor, cas sensor, injectors, and o2 sensor and still see a draw. I'll continue messing with it on my next day off. I read the MPI relay powers the ECU, as well. I'll unhook it to see if maybe its drawing power for some reason. Thanks for all the help! I'll update Tuesday
 
Well that's what I meant. Was using the method in the links to find out where. The MPI relay is a central control for a lot of things for the engine. As stated above I would just start unplugging things until you find it.
 
Found the issue! Ended up being a bad ECU. It was sending a constant ground trigger to the MPI relay, keeping the entire engine harness powered up with the key in the off position. Going to send it to ECMTuning for repair soon! Thanks for all the speedy help advice!!!
 
Support Vendors who Support the DSM Community
Boosted Fabrication ECM Tuning ExtremePSI Fuel Injector Clinic Innovation Products Jacks Transmissions JNZ Tuning Kiggly Racing Morrison Fabrications MyMitsubishiStore.com RixRacing RockAuto RTM Racing STM Tuned

Latest posts

Build Thread Updates

Vendor Updates

Latest Classifieds

Back
Top