generator to alternator

[foxfab]

Anyone have a wiring diagram or write up on how to convert from generator to alternator? I wanna drive my 25!

I have a 64-71 voltage regulator and an externally regulated alternator. I'll figure out how to mount it up, but how do I wire it all? Is this what I need for parts?

Thanks for the help, electrical isnt my best subject.

 

[destin]

While i do not know hoe to preform a conversion...

I supposed you could rebuild your generator and voltage regulator and juat drive it that way
Thats what i did for mine.

Others might have more info on the conversion.

Cheers

Destin

 

[foxfab]

I tried to have mine rebuilt and the shop claims that they cant get the parts . The field coils are bad. I do have a core but since I have all of what I believe are the alternator parts that I need, I just wanna get it together and drive it and worry about originality once it runs and charges again.

 

[destin]

I tried to have mine rebuilt and the shop claims that they cant get the parts . The field coils are bad. I do have a core but since I have all of what I believe are the alternator parts that I need, I just wanna get it together and drive it and worry about originality once it runs and charges again.

understandable

I saw this in the FAQ in the fj40 tech

https://forum.ih8mud.com/40-55-series-tech/120946-gm-alternator-info-faq.html#post1569709

May or may not be helpful

Cheers

 

[foxfab]

Thanks, thats more info than I've found. I bought a 3 wire 63 amp reman Delco alternator for $55. I'll work on mounting it up and then try to wire it using one of these methods.

With the three wire, you can keep the charge light on the dash.

 

[Cruiser_Nerd]

With the three wire, you can keep the charge light on the dash.

That's what I did with mine, just put a junction block where the regulator is. But you could just use the same terminal on the voltage regulator and leave it right in place. I did run the third sensing wire back to the battery, not sure if that was necessary.

 

[foxfab]

So Jim, you just removed the voltage regulator on the firewall and used the internal one in the alternator? Pics? Wiring diagram?

 

[Cruiser_Nerd]

OK Mike, I'm not responsible for electric fires..............

GM 10 SI internal regulator.

I removed the stock voltage regulator, left the stock main wiring harness untouched and put in a junction block. You can do the same thing by using the voltage regulator as a junction block (put the wires you want to connect under the same screw terminal) . The 25 generator to voltage regulator wiring harness is separate, so you can just remove it and set it aside with the generator.

This is the three wire setup:

#1 Big Lug on the alternator goes to the stock wire on the voltage regulator (this wire goes over to the starter terminal and then to the battery)

#2 Sensing Wire. I ran this all the way back to the battery, the idea being you want to sense the voltage there, not where you're making power. Since there is virtually no electrical demand in the 25 you can just jump this one to #1 and it would do the same thing.

#3 Field Wire. This goes to the stock wire on the voltage regulator and on to the charge light in the cluster. You want this one since it energizes the field right away, rather than having to get the alternator spinning fast to self energize (one wire setup).

 

[foxfab]

completed this project last week. Works great! I love these new fangled alternators!

Bought the wiring block at Boaters World for @$7.00.

Thanks Jim!