Over Charging Even with a new Alternator.

I honestly thought this was going to go a different direction.... What do ya know.

 

Have you checked all the cables even the one going from and to the battery. You might have a short. And how do you know its overcharging? Have you used multi voltage meter

 

Voltage regulator?

 

Its a real chance that you were sold a rebuilt alt. and it was bad out of the box?

 

You all forget about remote sense wire.

It runs from battery box to alternator.

If it is damaged and short to ground alternator overcharges.

Try to unscrew RS wire and jump RS terminal with positive terminal of alternator/

 

On some trucks, this wire may be connected to starter powitive terminal, for example on DAF XF trucks.

Inside alternator there is resistor connecting output terminal and RS terminal, but it may be corroded
so separate this wire and fit a pice of wire from output to RS terminal

 

Or.......
He might just have a positive and a negative wire on alternator and that's it.

Prob just a bad alternator.