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Old 09-12-2004, 08:55 AM   #1
toddtheodd
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External to Internal Voltage Regulated Altenator Conversion

This is the "no money spent" (except for the altenator) way to convert your external voltaged regulated altenator for an internally regulated one.
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Old 09-12-2004, 08:56 AM   #2
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First, you want to go to the parts store and get an altenator off of a 1983 to 1987 silverado. This will have pleny of amps for you, and will hook right up, with a little rewiring.
The little tag on the alt. says;
ULTIMA
01-0260
38039301
One of those is the part number.
Remember that the mounting tabs need to be at a 6 and noon configuration. Some are 6 and 10 or 6 and 2. These will not match up to our brackets. A quick glance to confirm that it will bolt up is all it takes.
It will look like this;
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Last edited by toddtheodd; 09-23-2004 at 01:31 PM.
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Old 09-12-2004, 08:57 AM   #3
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Now for the rewiring.
You have 4 wires running to the external voltage regulator.
blue, white, red, and brown.
Unplug the voltage reg.
Cut the blue and brown wires from the connector and crimp them together.
Like this;
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Last edited by toddtheodd; 09-23-2004 at 01:31 PM.
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Old 09-12-2004, 08:57 AM   #4
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Now the wire bundle that runs to your old altenator from the voltage regulator consists of the Red, White, and Blue wires.
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Last edited by toddtheodd; 09-23-2004 at 01:32 PM.
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Old 09-12-2004, 08:58 AM   #5
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The white wire is now pointless. So terminate it in some way.
I just ended it with a wire crimp.
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Last edited by toddtheodd; 09-23-2004 at 01:32 PM.
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Old 09-12-2004, 08:59 AM   #6
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Now the blue wire, which is just an extension of the brown wire, connects to the tab on the right (number 1 tab). The brown wire runs the the idiot light/gauge in the dash and is there for resistance to the internal voltage regulator. You can not skip this as it tells the regulator what it needs to be doing and when.
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Last edited by toddtheodd; 09-23-2004 at 01:33 PM.
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Old 09-12-2004, 08:59 AM   #7
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Now the other tab on the altenator needs power (tab # 2). And the best/easiest way to do this is with a jumper.
Run the Red wire to the Big post on the back like normal. And then with a short length of wire, run a jumper from the back post to the left tab.
Like this;
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Last edited by toddtheodd; 09-23-2004 at 01:33 PM.
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Old 09-12-2004, 09:00 AM   #8
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That's it.
You're done.
No more problems with external voltage regulators, and plenty of power to run whatever you want.
Todd
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Old 10-19-2004, 07:45 PM   #9
1972C10
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That Price must have came from O'Reamly's Check out Autozone They have it in stock as well.

ALTERNATOR for a
1984 PONTIAC TRANS AM
Normal Stock
Special Order
Not Available



Item Part
No.
Warranty Core
Value Unit
Price Availability
Store Web
DURALAST
94 AMP DL7294 LLT $30.00 $64.99
PREMIUM QUALITY REMAN, SOME NEW COMPONENTS

VALUCRAFT
94 AMP 7294 1 YR $30.00 $54.99
REMANUFACTURED UNIT
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Old 10-09-2016, 11:53 PM   #10
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What about the red wire to the regulator plug? Is it a dead end ?
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Old 10-12-2016, 08:41 PM   #11
Dustmaker65
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Re: External to Internal Voltage Regulated Altenator Conversion

Quote:
Originally Posted by Hotdog View Post
What about the red wire to the regulator plug? Is it a dead end ?
Yes...red and white going to regulator are no longer used.
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Old 10-29-2016, 04:12 PM   #12
Scooby63
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Question Re: External to Internal Voltage Regulated Altenator Conversion

I just bought another project, 1966 shortbed factory 4x4. Hasent been registered since 1999. Runs and drives, has a newer V8 small block (havent run numbers yet, I imagine it is a 350)
Anyway someone hacked up on the wiring when they installed the alternator.
I have everything pretty much sorted out, with one question.

The BROWN wire that comes from the cab harness is 12V when key is on.
The WHITE wire that comes off the pigtail in the #1 tab on the alternator puts out 14V when running.

Are these 2 supposed to be spliced to each other ??????

Reading a few write ups it sounds like I am supposed to connect these 2, but it seems wrong to connect one wire with 12V to another with 14V
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Old 03-04-2017, 05:50 PM   #13
dannyboy1224
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Unhappy Re: External to Internal Voltage Regulated Altenator Conversion

Hey guys, I found this really helpful, but once I got the alternator on I realized that the "fins" for the fan that draws air into the and through the alternator are going in the wrong direction. I pulled this thread up and looking in the picture, your's does as well. This will seriously affect the life of the alternator as it will not be pulling air through it. The engine turns clockwise on these old trucks, this alternator must be made for an engine turning counterclockwise? Thoughts? I'm going to try to find one of these style that is opposite direction.
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Old 03-19-2017, 10:34 AM   #14
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Re: External to Internal Voltage Regulated Altenator Conversion

Quote:
Originally Posted by dannyboy1224 View Post
Hey guys, I found this really helpful, but once I got the alternator on I realized that the "fins" for the fan that draws air into the and through the alternator are going in the wrong direction. I pulled this thread up and looking in the picture, your's does as well. This will seriously affect the life of the alternator as it will not be pulling air through it. The engine turns clockwise on these old trucks, this alternator must be made for an engine turning counterclockwise? Thoughts? I'm going to try to find one of these style that is opposite direction.
I am doing this along with my complete AAW rewiring of my '67 Chevy C20. Does the direction air flows thru the alternator really matter (pushing or pulling air thru the alternator)? AAW recommended same alternator with one wire conversion.

R/
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