Maybe a dumb question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

DBear · 11-15-2010, 10:37 PM

how do you identify if you have a internal or external regulated alternator? I am about to wire my 69 K5 and it did not have wiring when I got it.

swamp rat · 11-15-2010, 10:42 PM

Open this link and scroll down to the picture in post 44 and 45 that shows the back of the 2 different alternators and discription..
http://67-72chevytrucks.com/vboard/s...=415738&page=2

If your alternator is hooked up to a small black box looking thing (regulator) mounted to the radiator support buy the horn its probably external

In this thread post #9 on the bottom pic shoes the wireing diagran and the modification to the regulator plug. Just below the alternator shows the brown and read wire being looped back into the regulator plug.

http://67-72chevytrucks.com/vboard/s...d.php?t=417872

Both these threads will shead a lot of light.

McClinton527 · 11-15-2010, 10:46 PM

There should be a regulator that runs in conjunction with the wire harness out of the cab and the alternator. If your going one wire It all can be eliminated. When you make the one wire swap there's a specific GM one wire alternator you must use. It will have a couple studs off one end of it that accept eyelit style connectors with nuts, (often metric). I believe the standard alternator has a plug receiver on it that is designed to have the harness plug in to from the regulator. Good luck

DBear · 11-15-2010, 11:41 PM

[QUOTE=McClinton527;4296867]There should be a regulator that runs in conjunction with the wire harness out of the cab and the alternator. If your going one wire It all can be eliminated. When you make the one wire swap there's a specific GM one wire alternator you must use. It will have a couple studs off one end of it that accept eyelit style connectors with nuts, (often metric). I believe the standard alternator has a plug receiver on it that is designed to have the harness plug in to from the regulator. Good luck[/QUOT

McClinton, if I run this one wire system you are talking about, what wire off the harness to I run to the alternator?

McClinton527 · 11-16-2010, 12:29 AM

I believe its the purple one, you also obviously have to run one large gauge wire from the alternator to the battery to charge it

11-15-2010, 10:37 PM	#1
DBear Registered User Join Date: Nov 2008 Location: Rowlett, TX Posts: 867	Maybe a dumb question how do you identify if you have a internal or external regulated alternator? I am about to wire my 69 K5 and it did not have wiring when I got it.

11-15-2010, 10:42 PM	#2
swamp rat Registered User Join Date: Oct 2007 Location: Spanaway Posts: 8,451	Re: Maybe a dumb question Open this link and scroll down to the picture in post 44 and 45 that shows the back of the 2 different alternators and discription.. http://67-72chevytrucks.com/vboard/s...=415738&page=2 If your alternator is hooked up to a small black box looking thing (regulator) mounted to the radiator support buy the horn its probably external In this thread post #9 on the bottom pic shoes the wireing diagran and the modification to the regulator plug. Just below the alternator shows the brown and read wire being looped back into the regulator plug. http://67-72chevytrucks.com/vboard/s...d.php?t=417872 Both these threads will shead a lot of light. __________________ Mike. Swamp Rat build thread : http://67-72chevytrucks.com/vboard/s...d.php?t=595019 72 3/4T 4X4 4" BDS Lift 33" BFG's Last edited by swamp rat; 11-15-2010 at 11:26 PM.

11-15-2010, 10:46 PM	#3
McClinton527 Registered User Join Date: Sep 2010 Location: Albany, Oregon Posts: 66	Re: Maybe a dumb question There should be a regulator that runs in conjunction with the wire harness out of the cab and the alternator. If your going one wire It all can be eliminated. When you make the one wire swap there's a specific GM one wire alternator you must use. It will have a couple studs off one end of it that accept eyelit style connectors with nuts, (often metric). I believe the standard alternator has a plug receiver on it that is designed to have the harness plug in to from the regulator. Good luck

11-15-2010, 11:41 PM	#4
DBear Registered User Join Date: Nov 2008 Location: Rowlett, TX Posts: 867	Re: Maybe a dumb question [QUOTE=McClinton527;4296867]There should be a regulator that runs in conjunction with the wire harness out of the cab and the alternator. If your going one wire It all can be eliminated. When you make the one wire swap there's a specific GM one wire alternator you must use. It will have a couple studs off one end of it that accept eyelit style connectors with nuts, (often metric). I believe the standard alternator has a plug receiver on it that is designed to have the harness plug in to from the regulator. Good luck[/QUOT McClinton, if I run this one wire system you are talking about, what wire off the harness to I run to the alternator?

11-16-2010, 12:29 AM	#5
McClinton527 Registered User Join Date: Sep 2010 Location: Albany, Oregon Posts: 66	Re: Maybe a dumb question I believe its the purple one, you also obviously have to run one large gauge wire from the alternator to the battery to charge it



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