I have just got my truck running after swapping in a 1992 motor into my 1992 truck. For some reason my alternator is now overcharging when it did not do this before in the previous truck. Does anyone have any ideas? I am not real good at electrical stuff.

John

 

sounds likd a voltage regulator problem.

 

try running a ground wire form reg mounting bolt to alt mounting bolt

 

I have an internally regulated alternator. Can it be replaced and will the ground wire thing work?

 

Is it the stock alternator?

 

Wanna,

Yes it is the stock alternator.

John

 

If it is the stock one, it is regulated by the computer behind the battery.

 

Check for a pinched or chafed wire.

 

Wiring looks good. Is the regulator replaceable or do I have to replace the Alternator? Also any reason the computer would not regulate the voltage?

John

 

yes the voltage regulator is replaceable. me personaly i wont buy any othe voltage reg than the mopar blue. i have burned out 2 of mine and one of them boiled my battery once. you can by the mopar blue through summit
http://store.summitracing.com/partde...5&autoview=sku

 

i may be wrong but if rocktoy has an internaly regulated alternator then he cant use the external regulator unless he does the upgrade in the "sticky". Am i wrong about this?

 

Comptz,

you are correct, my voltage regulator is internal to the alternator. Do you kno if this can be replaced?

John

 

To tell you the truth i dont know if the internal regulator can be replaced. Mine is an 89 so i have the external regulator.

 

Yes, you can convert the '92 and '93 trucks to an external regulator. I was told by a fellow '91.5 owner (I never checked myself) that we already have the external regulator, but I'm not certain.

 

If you have a stock alternator it is externally regulated, no matter what year the truck is. '89-'91 trucks use an old school Mopar regulator on the firewall, '92 & '93 trucks are regulated by the PCM.

John, in your case I would recommend converting to the old style regulator. I like genuine Mopar units, and the good news is you can walk out of a junkyard with 4 or 5 for 20 bucks. Any Chrysler product from the early '70's to the late '80's has one.

The blue regulator is reliable but it is not temperature compensated. If you drive long distances it will overcharge the battery.