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Old 09-22-2010, 09:52 PM
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GM wire color code

I have wired several cars and just used differant color wires but with no "system". I have been looking for the General Motors color codes but can't find anything. It would be nice to wire to some sort of standard. Any help will be appricated.

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Old 09-23-2010, 05:18 AM
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Several wiring providers (Painless, Ron Francis, etc.) provide "GM color coded" replacement harnesses, but with a Google search I could not find any who offered documentation of that color code. All I found was a few specific references to stereo installations and trailer towing, but nothing for a full harness.

You might try calling a couple of the harness providers and see if they have documentation they could email to you.

Bruce
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Old 09-23-2010, 06:06 AM
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SSoooo
What car are you planning on re wiring???

Basic colors have remained unchanged thru most of the 70s/80s

Some colors were much different in the early 60s.

Any decent wiring schematic will have wiring size and color printed near the circuit---GM uses a metric gage from at least 79. But wire size conversion charts are available
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Old 09-23-2010, 06:47 AM
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One difficulty I found is there isn't wire w/"stripes" easily available for color coding a harness. Without having stripes, the colors are very quickly used up.

Just a suggestion, the wires can be "tagged" w/an ID- be it numbers, a description, or whatever. Clear shrink wrap can be applied to protect the ID from being lost, or a small ID tag can be slid inside the clear shrink wrap before shrinking.
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Old 09-23-2010, 10:09 AM
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Old 09-23-2010, 01:28 PM
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Quote:
Originally Posted by cobalt327
One difficulty I found is there isn't wire w/"stripes" easily available for color coding a harness. Without having stripes, the colors are very quickly used up.
M&H Electric offers wire with stripes in 20' lengths---kinda pricey tho
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Old 09-23-2010, 04:05 PM
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I love the use of the "GM" color code, considering that GM used a whole lot of different wiring color codes over the decades.
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Old 09-23-2010, 05:06 PM
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The marine industry uses a lot of striped wires available at your local marine supply stores. they too are a little bit pricey because their wire is tinned to slow down the corrosion.
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Old 09-23-2010, 07:32 PM
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hi,
for laying a stripe on a wire, a Sharpie pen works for me. and they do have many colors available. through handling of the wire, the ink may wear off, but i doubt along the whole length of the wire. doesn't hurt to keep document your wiring upgrades/changes either
mark
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Old 09-23-2010, 09:24 PM
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I was just thinking that a blue wire ment something or a pink went from a switch ie. There must be some rhime and reason to it.
I'm doing a 51 chevy hot rod, a 37 chevy hot rod and a 65 el camino. Just wanted it to be close to some sort of "standard"
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Old 09-24-2010, 08:08 AM
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i'd use the El Camino as the standard. search for wiring diagrams as they should show colors.

red... battery feed, usually protected by fusible link,
orange... battery feed, protected through fusebox,
black... ground,
pink... ignition,
purple... starter solenoid,
brown... accessory power,
tan... high beam headlights,
light green... low beam headlights,
brown... parking lights,
light blue... left front t.s.,
dark blue... right front t.s.,
yellow... left rear t.s./stop,
dark green... right rear t.s./stop,
light green... backup lights,
gray... dash illumination,
white... dome/ courtesy lights,
dark blue... oil pressure sender,
dark green... water temp sender,
tan... fuel level sender,
brown... charge indicator,

info above taken from '67 Chevrolet diagram,
of course there is more.

mark
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Old 09-24-2010, 11:55 AM
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Mark pretty well gave you the skinny on GM wiring. The only thing that I'll add is that if it has a stripe on the wire it usually means that it is 'switched power'. For example, if the power running to the switch is yellow, the wire running to the unit being powered will be yellow with a black stripe, always a contrasting color, blue with white or black stripe.

12 ga. wires usually carry up to 20 amps of power, 14 ga up to 15, 16 ga. always less than 15 amps.

If your wiring up your '65, you should be able to find a wiring diagram quite easily for it.
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Old 09-24-2010, 12:57 PM
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GM colors

I think the GM engineer in charge only had an 8 crayon box when he was a kid, they use the same colors several times, just different gages. for a good wiring diagram you can go to the ez2wire website and down load a free several page diagram that uses GM Colors
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Old 09-24-2010, 02:59 PM
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GM Color code

I have wired over 200 street rods and most of the time I have used GM color code. It was on another post before this one and they pretty much had it right.
On the steering column plug, which is the tail lights, brake lights, turn signals, flashers, and horn. In order on plugs follows
White stop light switch, the other side of SW. red to fuse panel
Dark Green Right Rear Stop Light And Turn Signal.
Yellow Left Rear Stop Light And Turn Signal
Purple Turn Signal Flasher This is power from fuse panel.
Brown Hazard Flasher This is power from fuse panel.
Dark Blue Right Front Turn Signal.
Light Blue Left Front Turn Signal Both front turn signals you can also put a wire with them to your turn signal indicator lights.
Black Horn On some Buick's this will be a green wire, why no idea.

Now as far as the columns with the plug for the ignition switches go these might not be color coded they may identify connections by letter/number sequence.

Now on another post someone said using 12ga, 14ga, and 16 ga, I have seen cars burn when they use 12gauge wire from the Alt. TO starter USE 10 gauge and I would put a fusible link right by the Alt. 14 gauges on most of the others is ok but wires on the ING. system should be 10gauge.
On the battery the farther you get from the starter the bigger the wire, make sure you have a good ground from motor to frame, I see a lot of people ground from the transmission to the frame that really is not a good ground because Alum. is not a great conductor. Best place, I think is one of the starter bolts.
If you have a glass car you will need to buy or make grounding kits. GM only uses (that I have seen ) wires with a stripe like when you have two or three lights on one side and only one flashes, and the other stays on for brakes. but I don't do those , I think the newest car I have wired is a 57 t-bird.
Now ford does use wires with stripes, where to get them is another deal I get my wire from a place called Wytech,but they don't sell to the public. I would think you could go on line and find a place you could buy from.
Well between this post and the other before mine, you should be able to have the color codes . Also you should use a headlight switch with a self contained fuse Ford, GM, etc use this type of switch. if you don't you will have to but a fuse between switch and fuse board. I don't have the light switch colors in front of me I know tail lights are brown, but I think they were on the other post.




Later 35terraplane
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Old 09-26-2010, 08:52 PM
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Thanks for all the info. That helps a lot. Steve
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