Alternator charger problem

[GT35065]

The guy that is helping me suggested converting it back to three wire too. That might be a good option. Then it would be using the regulator that came with the car instead of the one that is in the alternator.

Volt meter reads near the center until you turn on the fans and then it goes about a quarter way towards the plus side. You would think it would go to the negative side with the extra draw on the system.

[Gaz64]

So your ammeter is reading in reverse?

Does it ever read in the negative?

Which by your description of your ammeter, would be charging not discharging.

Personally, I've never liked ammeters for the extra wire etc. Like voltmeters much better.

[jhv48]

So, under normal driving, with the lights and fan off, is the ammeter needle to the right or left of the center mark? It Should be slightly to the right (the plus side). If it stays to the left of center, then your alternator/regulator is not functioning properly and you're running off the battery.

If not, and the needle goes to the right of center when the fan and lights are all on then it's wired incorrectly. It should be slightly to the left of center when all accessories are on and the engine is running.

[STEVE-O]

Originally Posted by GT35065

The guy that is helping me suggested converting it back to three wire too. That might be a good option. Then it would be using the regulator that came with the car instead of the one that is in the alternator.

Volt meter reads near the center until you turn on the fans and then it goes about a quarter way towards the plus side. You would think it would go to the negative side with the extra draw on the system.

Be aware that if you switch back to the 3 wire using the cars voltage regulator that there is a wiring change for SPF cars. It involves moving the sense wire on the regulator to prevent overcharging the battery and is indicated by ammeter needle fluttering.