Engine/Transmission (1994 - 1998) Voltage Regulator / Alternator question

[CWeaver]

Voltage Regulator / Alternator application questions

I have a 96' 12V truck that I recently replaced the Alternator.



A couple questions:



The Advanced Auto store said they couldn't get a 136Amp just a 120Amp.

Is the difference just the bigger pully on the 136 Amp alternator?



I plan to rebuild the old Alternator with a kit from Geno's.

I'd like to put the rebuilt alternator in my off-road Jeep as it needs a big alternator for winching. What would I need to get to do this? (as I belive the alternator is externally regulated)



Just a Voltage regulator? Where is this located on our trucks? is it separate or on the Alternator?



Thanks!

 

[snappy]

Can not answer the pulley question, but voltage regulation is controlled by the computer. You would have to add external regulation.

 

[CWeaver]

I have a 96 12V truck with Manual Trans. What "computer" do I have? I know this truck is very light on electronics which is why I choose it... . Thanks!

 

[Bob4x4]

I have a 96 12V truck with Manual Trans. What "computer" do I have? I know this truck is very light on electronics which is why I choose it... . Thanks!

The pcm mounted on the firewall controls charging,cruise control,and trans if automatic as well as a few minor items.

It will depend on what year Jeep you have as to weather or not it's charging system is also pcm controlled

 

[CWeaver]

The Jeep is a 82' CJ-8 Scrambler. I rewired it from scratch so no PCM per say.

It has a stand alone GM fuel injection computer and a basic Mopar Orange ingnition box of Dodge muscle car vintage.



So it sounds like I may need to go from the Alternator to a external voltage regulator to the Jeep. Or I guess the main power feed goes to the jeep & the voltage regulator controls what the alternator puts out? I'm new to Alternators that are not internally regulated... . Anyone done this? Maybe just go with a aftermarker volatge regulator?

 

[Berrigan]

Do a search and use words like external voltage regulator. I know sometime back on this forum there was discussions about the pcm failing only on the voltage regulator portion. Some crafty member posted a wiring diagram of how to use the old 70s mopar external solid state regulator. The pcm is expensive and the old mopar regulators are cheap. Even cheaper if you get aftermarket stuff at Autozone. I believe the circuit is a very simple 2 wire hook up. If memory serves the regulator is in series with the field circuit on the alternator. The regulator controls the "quality" of the ground connection. The better the quality of the ground the more amps the alternator puts out. Bill

 

[Bob4x4]

The Dodge voltage regulators are very simple,easy to wire and the pigtail to match the regulator is easy to find

 

[DieselDoghouse]

Isn't the 120A for the gassers and designed to be turned much faster? If AAP can't get one do you have Autozone nearby?, thats where I got mine, and they can get bosch or nippondenso styles. As to the transplant in the jeep, the regulator should be sized to alternator output and armature loading. There are many schematics floating around to use LSI IC chips and build your own... in Vet school I had the only datsun B210 with 120A!!

 

[hsmith]

Think about the single wire self-exciting alternator for your conversion since you have done your own wiring . GM style. Not sure what amp sizes are available.