Externally Regulater to Internally Regulater Conversion - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Ford Assassin · 10-21-2008, 12:42 AM

Hey guys, I am finishing up my LSx 5.3 conversion in my '69 C10. Well I dropped in the battery and hooked up the terminals only to find out I don't have most of my electrical working. After chasing a few wires with a test light I realized I am not going through my external regulator anymore. My alternator has a single power post on the back, so basically its a one-wire alternator.

I did a quick search and found out that several vendors sell conversion harnesses for $20+ shipping. Myself being a cheap guy (especially since I am over budget as it is on this swap) I figure I can make my own jumpers to create the same thing.

So does anyone know what I need to do to convert this thing over?

Any help is thanked in advance.

**El Jay** · 10-21-2008, 02:49 AM

Okay. I'm completely computer illiterate. So I can't post a direct link.
But, KRUE has taken a huge amount of time to compile a whole mess of FAQ's and their answers.

Just "cut & paste this to "SEARCH" near the very top of the page.

External to Internal Voltage Regulated Altenator Conversion

It will come up in about the 3rd post in his total posts.

I hope this helps a bit.

BTW, I used this to convert to an internally regulated alternator.
It's easier than all get out. And other than the cost of the alternator, it costs about, maybe $6.00, if that. About $5.00 was for a "replacement plug" for the new style alternator. (available @ any decent, or mediocre auto supply).

**VetteVet** · 10-21-2008, 07:01 AM

http://67-72chevytrucks.com/vboard/s...d.php?t=119379
This one is for the internal regulated 12SI that most people have. If you have a one-wire then just hook a 10 gage wire to the terminal on the back and run it to the battery positive post.

Ford Assassin · 10-21-2008, 10:03 AM

My alternator is the latest design. In its intended application (and the way its currently setup in my truck) it has a single post that runs a 8 gauge wire to the + side of the battery. Then it has another connector plug that runs directly into the factory computer wire harness. I am assuming the computer controls the regulator in this case.

I don't have the two other 'tabs' like most other 10si and 12si alternators it makes things alittle harder.

10-21-2008, 12:42 AM	#1
Ford Assassin Registered User Join Date: Jun 2008 Location: Jackson, Ca. Posts: 674	Externally Regulater to Internally Regulater Conversion Hey guys, I am finishing up my LSx 5.3 conversion in my '69 C10. Well I dropped in the battery and hooked up the terminals only to find out I don't have most of my electrical working. After chasing a few wires with a test light I realized I am not going through my external regulator anymore. My alternator has a single power post on the back, so basically its a one-wire alternator. I did a quick search and found out that several vendors sell conversion harnesses for $20+ shipping. Myself being a cheap guy (especially since I am over budget as it is on this swap) I figure I can make my own jumpers to create the same thing. So does anyone know what I need to do to convert this thing over? Any help is thanked in advance. __________________ Cable -K5 Blazer 2wd: 6.0 LQ4, 7875 Turbo, Tick Stage II Turbo Cam, Built 4L80e, RevMax Billet 3600, 9.5" 14 Bolt -Chevy 3+3 Crew Cab Dually: Cummins 12v P-Pump Swap, Compound Turbos, A2W Intercooler, NV4500HD, 4wd conversion, Radius Arms, Coilovers, Crossover Steering, etc Build Thread: http://67-72chevytrucks.com/vboard/s...d.php?t=803608

10-21-2008, 02:49 AM	#2
El Jay Gone to greener pastures Join Date: May 2007 Location: Gateway to the Delta Posts: 7,354	Re: Externally Regulater to Internally Regulater Conversion Okay. I'm completely computer illiterate. So I can't post a direct link. But, KRUE has taken a huge amount of time to compile a whole mess of FAQ's and their answers. Just "cut & paste this to "SEARCH" near the very top of the page. External to Internal Voltage Regulated Altenator Conversion It will come up in about the 3rd post in his total posts. I hope this helps a bit. BTW, I used this to convert to an internally regulated alternator. It's easier than all get out. And other than the cost of the alternator, it costs about, maybe $6.00, if that. About $5.00 was for a "replacement plug" for the new style alternator. (available @ any decent, or mediocre auto supply). __________________ '69 Chevy 1/2 T LWB Stepper: Daily Beater '72 GMC 3/4 T Fleet: Another Daily Beater '72 Plymouth Gran Coupe: ? "Ah women. They make the highs higher and the lows more frequent." Friedrich Nietzsche "Never kick a fresh turd on a hot day." Harry S. Truman GUN CONTROL: Never having to say, "I missed you." Always fire two warning shots into your attacker's chest area before putting a bullet between his eyes. Paraphrased from Louis Awerbuck

10-21-2008, 07:01 AM	#3
VetteVet Msgt USAF Ret Join Date: Jan 2005 Location: Kalamazoo, Michigan Posts: 8,719	Re: Externally Regulater to Internally Regulater Conversion http://67-72chevytrucks.com/vboard/s...d.php?t=119379 This one is for the internal regulated 12SI that most people have. If you have a one-wire then just hook a 10 gage wire to the terminal on the back and run it to the battery positive post. __________________ VetteVet metallic green 67 stepside 74 corvette convertible 1965 Harley sportster 1995 Harley wide glide Growing old is hell, but it beats the alternative.

10-21-2008, 10:03 AM	#4
Ford Assassin Registered User Join Date: Jun 2008 Location: Jackson, Ca. Posts: 674	Re: Externally Regulater to Internally Regulater Conversion My alternator is the latest design. In its intended application (and the way its currently setup in my truck) it has a single post that runs a 8 gauge wire to the + side of the battery. Then it has another connector plug that runs directly into the factory computer wire harness. I am assuming the computer controls the regulator in this case. I don't have the two other 'tabs' like most other 10si and 12si alternators it makes things alittle harder. __________________ Cable -K5 Blazer 2wd: 6.0 LQ4, 7875 Turbo, Tick Stage II Turbo Cam, Built 4L80e, RevMax Billet 3600, 9.5" 14 Bolt -Chevy 3+3 Crew Cab Dually: Cummins 12v P-Pump Swap, Compound Turbos, A2W Intercooler, NV4500HD, 4wd conversion, Radius Arms, Coilovers, Crossover Steering, etc Build Thread: http://67-72chevytrucks.com/vboard/s...d.php?t=803608

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