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Old 11-29-2007, 11:10 AM
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Wiring Harness Information

Hi-
Long time lurker here, first time poster, but i've gleaned a LOT of useful information from this site, so i thank everyone for their (unknowing) help.
Here is my dilemna: I have a '75 Chevy Cheyenne with a crate 350/350 and about 10,000 wiring gremlins, I've been gradually chasing everything down, replacing as I go, re-grounding, etc. I've decided to just redo the entire thing, and am trying to decide what harness to go with. Painless seems very comprehensive, but the price point is a limiting factor, Summit looks good, but after extensive searching, I can't seem to find anyone who can vouch for their use in anything later than about '65. I am also wondering if anyone knows the big difference between the 67-72 Painless harness (PN 10206) and the 73-87 harness (PN 10205), because 100$ is a big difference to me.
Thank you all in advance.

EDIT: I have done quite a bit of searching, and gone through all of the Wiring Harness Poll, just wondering if anyone had some specific info for me. Thanks Again

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Last edited by MrBrightside; 11-29-2007 at 11:14 AM. Reason: Addl. Info.
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Old 11-29-2007, 12:02 PM
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Off the top of my head, the harness for 73-86 is for a more complex vehicle that has extensive heater/ac controls compared to the 67-72 model.

As far as which one you should purchase I can tell you this. Some of the cheaper ones you will wind up buying items to finish the wiring. The instructions lack quite a bit. The tech support is lacking. The quality of wire may not be what it should be.

I have installed some cheaper harnesses. I have installed a Painless harness in my 34 after I tried to install a lesser quality one. Yes Painless is a more expensive harness, but the quality shows when you compare apples to apples. The tech support you get from Painless is second to none.

Your choice
Vince
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Old 11-29-2007, 01:02 PM
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Take a look at American Autowire - they specialize in OEM replacements for GMs. You can replace all or part of the OEM harnesses (I'm using one of their Street Rod kits and find their quality very good)

http://www.americanautowire.com/Download_Catalogs.html

While I do agree with Vince, the Painless Kits are good but are pretty much universal.

Dave
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Old 12-01-2007, 09:22 PM
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I did a few cars with EZ-wire.I think it was a very nice Product.And the price was great.
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Old 12-09-2007, 09:51 AM
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I Also Am Having Problems With My Electrical

I have been working on my car now for a year. I cant remember how to hook up the basic battery to alt. and then to a 2 post braker on my wheel well.

I know the neg. gets grounded to the fender. What and where do I put the wires for the charging system? Does any ground come off the positive side of the battery? does the positive go to the back of the alt? Please I know this is abc stuff but I have C.R.S. and need lots of help. Thanks and Happy Happy
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Old 12-09-2007, 10:43 AM
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Ground cable from battery goes to engine block. An additional ground strap goes from engine block to frame, One more ground strap goes from body to frame. Depending on what car your working on and how it is wired the positive battery cable goes to the starter solenoid.

Vince
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Old 12-10-2007, 06:32 AM
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Hey Vince,

Thanks for your reply. I still am missing something here. First let me tell you what I am working with. I dropped a 1971 350 into a 1985 Camino. Now I have this little box on my fender well that has 2 posts on it. It has been screwed to the wheel well and was connected to it before.

I have a wire with a closed loop on it coming off the back of the altenator.
The positive side of the battery is going to the starter. I am lost to where this closed loop goes from the alt. I have the negative grounded well to the altenator bracket with a nut and bolt and took off all the paint under the that closed loop. So where does this altenator wire go to thats coming from the back of the altenator. Thanks for your help, Dennis
P.S. I have checked and rechecked all my grounds and they are all good to go. I just can't figure out how this all loops together as one unit. The altenator has 2 wires coming out of it's clip where it gets plugged in. One is hard wired in the circuit. The other is just there with that closed loop on it's end. I hope this makes it clearer for you. Dennis. Love that 302 first. Then came my 327 with camel hump heads and a 4 speed. Thanks again. Denis

Last edited by KACHINA321; 12-10-2007 at 06:38 AM.
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Old 12-10-2007, 11:52 AM
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If its a GM 10si or 12si alternator, there are three connections. Two of them are in the standard two wire plug and the other is the main charging wire that connects to the screw post terminal on the back of the alternator.

The extra wire loop on the two wire plug can be connected to the same screw post on the alternator where the charge wire connects. The other wire in the two-wire plug should switch on and off with the ignition.

This site shows a picture of the connections, and some discussion.
http://www.autorewire.com/tech/charg...10SInandd.html
http://www.oldengine.org/unfaq/10si.htm

Bruce
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Old 12-11-2007, 12:12 PM
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Hey Bruce

First I Want To Thank You For Your Time In This Matter.

For Some Reason I Have Tried To Wire Up The Way The Picture Shows.

Now Do I Put One Of Those Wires Coming Off The Back Of The Alt. Into A Splice On The One Coming From The 2 Wire Plug?

Then I Run The Other To The Neg. Side Of The Battery? Then I Ground The Wire From The Cable To The Fender?

Thanks For Your Help, Dennis In Vegas
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Old 12-12-2007, 08:22 PM
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Hold on, Dennis!!

There are 3 connections on a Delco alternator- the two wire plug(one heavy gauge and one light gauge wire) and a post for a 3/8" ring terminal. The heavy gauge wire in the connector can go on the post on the alternator itself. The light gauge wire I believe is used for the warning light???( not sure) There needs to be a heavy gauge wire in the car harness that is connected to the post on the alternator, it should have 12 volts from the battery at all times. There are NO wires from the alternator that connect to ground or the battery negative post , the alternator is grounded thru the case.
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Old 12-12-2007, 10:05 PM
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Hey Putt

tHANKS FOR THE REPLY. iF I AM GETTING YOU RIGHT YOU ARE TELLING ME THERE SHOULD BE NO GROUND TO THE ALT. iS THIS CORRECT? i HAVE A GROUND GOING TO MY FENDER FROM MY NEG. POST ON THE BATTERY. tHE HEAVY RED WIRE THAT IS COMING OUT OF THE TOP OF THE ALT. IS RUNNING TO THE BACK OF THE ALT. ON THAT POST. THS SMALLER WIRE THAT IS ALSO IN THE ALT. IS RUNNING INTO A HARNESS. i HAVE THE POSITIVE CABLE GOING TO THE STARTER. STILL WHEN I TAKE OFF MY POSITIVE CABLE THE ENGINE DIES. WHICH IS TELLING ME SOMETHING IS NOT RIGHT. I JUST INSTALLED A NEW ALT. AND BATTERY. I HAVE BEEN WORKING ON THIS CAR FOR A YEAR NOW AND HAD SOME FRIENDS HELPING THAT ARE NO LONGER AROUND. I AM A CARPENTER BY TRADE. BY NO MEANS AM I A WRENCH. I WISH I WAS. IF YOU TOLD ME A YEAR AGO THAT I WAS GOING TO TAKE APART MY FRONT END TO DROP AN ENGINE IN MY CAR. I WOULD HAVE TOLD YOU THAT YOU WERE OUT OF YOUR MIND. NOT ONLY THAT I REBULT THE TOP END OF A HARLEY THIS YEAR. I GUESS WHEN WE HAVE THAT OLD ITALIAN DISEASE CALLED MAFUNZALO. YOU TRY ANYTHING.
THANKS FOR THE REPLY. IF YOU NEVER HEARD OF MAFUNZALO. IT TRANSLATES INTO MY FUNDS ARE LOW.....HAPPY HOLIDAYS TO YOU AND YOURS. DENNIS IN VEGAS
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Old 12-13-2007, 06:22 AM
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The alternator bracket should have a large gauge (#4?) ground wire that is connected directly to the negative battery terminal. The negative terminal on the battery also has a smaller ground wire that runs over to the fender to provide a chassis ground.
There is also a ground wire from the rear, passenger side of the engine (probably on a valve cover bolt) and it connects to the firewall. There is an instrument panel ground up under the dash, and another ground somewhere on the taillight.

For internally regulated 10si or 12si:
The large positive cable from the battery connects to the large terminal on the starter. Stock wiring for the alternator connects the BAT terminal (the threaded post) to the same point on the starter, and uses the large starter terminal as a junction for 12v power. There is usually a third wire on the starter terminal, and it supplies power to the fuse box. This means that you have to make sure that connection on the starter is secure, or you don't have any power to anything in the vehicle.
However, you can make a simpler connection. Run a wire directly from the alternator battery terminal over to the battery positive terminal, splicing in a fusible link for protection. I think the stock connection is a 10 gauge wire and 14 gauge fusible link.

Bruce
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Old 12-18-2007, 06:58 AM
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Quote:
Originally Posted by KACHINA321
tHANKS FOR THE REPLY. iF I AM GETTING YOU RIGHT YOU ARE TELLING ME THERE SHOULD BE NO GROUND TO THE ALT. iS THIS CORRECT? i HAVE A GROUND GOING TO MY FENDER FROM MY NEG. POST ON THE BATTERY. tHE HEAVY RED WIRE THAT IS COMING OUT OF THE TOP OF THE ALT. IS RUNNING TO THE BACK OF THE ALT. ON THAT POST. THS SMALLER WIRE THAT IS ALSO IN THE ALT. IS RUNNING INTO A HARNESS. i HAVE THE POSITIVE CABLE GOING TO THE STARTER. STILL WHEN I TAKE OFF MY POSITIVE CABLE THE ENGINE DIES. WHICH IS TELLING ME SOMETHING IS NOT RIGHT. I JUST INSTALLED A NEW ALT. AND BATTERY. I HAVE BEEN WORKING ON THIS CAR FOR A YEAR NOW AND HAD SOME FRIENDS HELPING THAT ARE NO LONGER AROUND. I AM A CARPENTER BY TRADE. BY NO MEANS AM I A WRENCH. I WISH I WAS. IF YOU TOLD ME A YEAR AGO THAT I WAS GOING TO TAKE APART MY FRONT END TO DROP AN ENGINE IN MY CAR. I WOULD HAVE TOLD YOU THAT YOU WERE OUT OF YOUR MIND. NOT ONLY THAT I REBULT THE TOP END OF A HARLEY THIS YEAR. I GUESS WHEN WE HAVE THAT OLD ITALIAN DISEASE CALLED MAFUNZALO. YOU TRY ANYTHING.
THANKS FOR THE REPLY. IF YOU NEVER HEARD OF MAFUNZALO. IT TRANSLATES INTO MY FUNDS ARE LOW.....HAPPY HOLIDAYS TO YOU AND YOURS. DENNIS IN VEGAS
DO NOT DO THIS!!!!!!!!!! This is an old tale that relates to generators, not alternators. This can (not always) destroy the electronics in the alternator. It can fry the computer on new cars with them!! It causes a voltage spike that is not friendly to the alternator and any other electronic devices on the car.

I like mafunzalo!!!
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