2G Charging Issues

[djseclipse]

New battery installed in February 2016. Car has basically sat in garage. Every week I would start the car and let run for 10-15 mins. Finally this past Friday I get the car out and drive it some. On my hks turbo timer I noticed voltage ranging from 11.2 volts and 13.6 volts. Thought nothing of it. Saturday car starts up fine. Drive to a show that morning, everything seems fine. Saturday night I take it for a spin and notice the volts dropping back into the 11's. Shut car off and go into the store. Started right back up and noticed the brake and battery lights were on, but, very dim. Lights went off and volts back around 13.6. Parked car and then went to start it up Sunday night, and nothing, battery is completely dead. I'm guessing bad alternator? I also noticed the walbro whining was more quite when the voltage dropped. It is rewired and fused directly off the battery.

 

[djseclipse]

So I put a new battery in today. Car starts right up and idles perfectly at 1k rpms and voltage hovers between 13.5 and 13.8. I switch the car off and let sit and then fire it back up. Now idle is fluctuating and volts around 12.2. Would a bad alternator charge fine one moment and not the next? I will try to upload a video.

 

[djseclipse]

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[djseclipse]

Sorry couldn't get video link to work. The picture says it all though.

 

[Rsawd95dsm]

Sounds like a bad alternator. Could be a short in the voltage regulator in the alternator. Parts stores can test alternators on or off the car.

 

[asexton6969]

Yes, sounds like a voltage regulator issue. Change out that alternator and be done.