Thread: Electronic Problems

Hey guys, I've got an issue with this 04 Comp G again. I have done the big 3 electrical upgrade to the car and ever since then I've been having issues with the car.

When I start my car the volts will be around 11v to 12v. And as I drive they will go back up slowly to 14 but it takes a while. Now I thought it was my battery so I bought an odyssey battery, brand new. Still the same thing. So I bought a new alternator, still the same problem.

I have no idea what's going on here, sometimes I'll be driving and the volts will drop to 11 and then my cars abs, traction control system and stability control lights will flash all at once and at the same time a system charging failure.

With the big 3 upgrade I kept every oem battery wire intact and connected except I replaced the short cable that goes from the fuse box to the battery with a 0gauge wire.

Any ideas what's going on here?

Rule out the wiring first by testing for voltage drop. You'll need a multimeter set to measure DC volts. A second person would be helpful to keep the RPM's around 2000.

While the engine is running, create a load on the charging system (I usually just turn on the headlights and set the blower to max) and then test the connections between the battery and the alternator, as well as between the fusebox and battery. To test the positive charge wire, put one lead on the alternator positive post and the other lead on the battery positive post. Then for the negative charge wire use the alternator casing and the battery negative post. For the fusebox wire use the battery positive post and the fusebox post. Ideally you want to see .1 volts or less, more than that could indicate excessive resistance in the wiring.

Also to note is the current sensor that the battery ground cable goes through. I can't recall if all 04-08 GP's had them or if it was added later on (my 05 does), but you have to make sure all the wiring going from battery negative to ground goes through it or its reading will be incorrect. The PCM uses its reading to decide what voltage the alternator produces.

Thanks for the response. I'll have to check with the ground. I have the stock ground cable that I left alone, but I added a 0gauge so maybe that's messing with me? I don't know I'll have to check all this out cause its been a problem for too long.