1995 Bonneville - Charging system failure - Not alternator!
Hi, I'm new to the board - I'm hoping someone can give me some ideas on lots of electrical problems I'm having...
Car will not charge - voltmeter in dash reads 12V or lower. Over the last couple of months, it used to charge, then the voltage would go down, then slowly back up to 14. Over time the problem got worse, and now it spends way more time at 12V or lower than it does at 14. Sometimes it goes down to 13 or so too. My batt couldn't handle it the other day and I had to get towed.
Also whenever the voltage is at 12v, the car has no power. It takes forever to get going from a stop, if I floor it it only goes to about 2k rpm and the car takes it'* time gaining speed (not good when you need to turn into traffic).
Also when the voltag is at 12V, occasionally on start the engine will rev up to 2k rpm and stay there. If I push the gas a bit it will rev higher (3k) and stay there even when I take my foot off. If I put it in drive, the revs go down, but N or P and it goes back up...
Also sometimes I get a fast clicking from the Fuel pump relay and a relay under hood (closest to driver - what does this one control?) This happens when I put key to ON position. Car will not start while relays clicking.
Also when I put the key to ON position, sometimes the cooling fans turn on even though the engine is cold and the temp meter says they should be off. Sometimes when the voltage is 12V, the fans won't come on when they should - doh!
Anyways - the car is not reliable when the voltage is at 12V and I need to get the charging system running again...
Tested alternator at autozone - PASS.
Tried new alternator anyways - same problem
Put old one back in - same problem.
new fuel pump because old one was whining a lot - same problem
new plugs/ wires / TPS
I checked every fuse in the car (all 3 panels) all are good.
I took apart the fuse/relay center and cleaned it up, made sure all connections good.
wiggled every wire I could find, trying to find trouble spot - only found unreproducable ghosts
Removed all fuses that I could and keep car still running - still have same problem...
Took computer case apart and looked at everything - looks OK, no burnt up spots, etc.
I'll try anything at this point - please help!