I've been trying to track down this problem for a while. I have a radar detector that also outputs battery charge (not an exact reading, I know!). The trend in battery output has been decidedly down, to the point where the low volt warning sporatically comes on the car temporarily loses power for a few seconds.
Things I have tried:
- Had the battery recharged at the auto parts store.
- Replaced the alternator.
- Disconnected a faulty digital gauge the previous owner had put in.
- Tightened down a loose bolt connecting the ground strap from the battery (it had some yellow corrosion on it).
- Checked and cleaned battery terminals.
Right now when running, a voltimeter reading at the battery says 13.5 (no accessories) and 12.9 (AC full blast, headlights on). These readings seem low to me (I've read that the reading should be around 13.8 or more).
I've been told that there is a ground from the engine to the transmission, but I don't see anything like that under the car. Someone also mentioned insulation flaking off and causing grounding problems. Didn't see anything like that though.
What else should I check?
Thanks folks.