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Old 02-22-2011, 06:28 PM
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1968 gto wiring help needed

I cant find the wiring diagram for my 68. I'm having trouble with my running lights fuse blowing. Does anyone have the diagram or know where to see it online?

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Old 02-22-2011, 06:47 PM
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Quote:
Originally Posted by adam83
I cant find the wiring diagram for my 68. I'm having trouble with my running lights fuse blowing. Does anyone have the diagram or know where to see it online?
You COULD buy a factory service manual...
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Old 02-22-2011, 07:20 PM
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Yeah I know Im just underfunded right now
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Old 02-23-2011, 12:02 AM
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There are 5 wires feeding the back tail lights, side marker lights, gas gauge and license plate light. Dark Green, Light Green, Yellow, Tan, Brown. The brown wire splits and feeds the tail light assemblies, side marker lights, and license plate lights. The yellow splits and feeds both tail light assemblies. I am assuming that the yellow wire is the brake light circuit, and the the brown is the running lights circuit (when the headlight switch is pulled out). For some reason, I think the previous owner accidentally put both the running lights and the brake lights on the same circuit, as I got no brake lights, and the running lights keep blowing their fuse when I turn them on.

So, I want to trace back the brake light circuit back from the trunk and I'm pretty sure it's the yellow wire, but I dont know for sure.
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Old 02-23-2011, 03:44 AM
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Pull all the light bulb sockets from the tail light housings.... see if it blows..... sounds like you have got some wires shorted, very well could be a bulb socket... if you remove the from the housing you eliminate the grounds..... if she doesn't blow a fuse , pull in one at a time till you find the one that blows etc....
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Old 02-23-2011, 04:16 AM
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Yellow is the left turn/stop wire
Green is the right turn/stop
Brown is the taillamps-----might have a look at the license lamp as these do short out to the bumper occaisionally

Light green should be the back-up lamps
tan should be the gas gage

brake lights are fed by the turn signal switch and should have nothing to do with the taillights

You can try disconnecting the rear harness under the dash and see if the fuse still blows----if not----issue is in that harness----if yes----issue will be between the headlight switch and the harness plug.

This is a 7 way weird looking harness connector that is located near the fusebox and then runs behind the firewall mat to under the carpet.
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Old 02-23-2011, 05:59 AM
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Front portion of the wiring:

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Old 02-23-2011, 06:17 AM
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'68 REAR:

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Old 02-23-2011, 12:25 PM
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Quote:
Originally Posted by Bryan59EC
Yellow is the left turn/stop wire
Green is the right turn/stop
Brown is the taillamps-----might have a look at the license lamp as these do short out to the bumper occaisionally

Light green should be the back-up lamps
tan should be the gas gage

brake lights are fed by the turn signal switch and should have nothing to do with the taillights

You can try disconnecting the rear harness under the dash and see if the fuse still blows----if not----issue is in that harness----if yes----issue will be between the headlight switch and the harness plug.

This is a 7 way weird looking harness connector that is located near the fusebox and then runs behind the firewall mat to under the carpet.

you are completely right abvout the colors of the wires and where they go, I made some grammar mistakes in my post.

I think my brake stop lights are only working when the light switch is pulled out. And when the switch is pulled out, 95% of the time the running lights fuse blows immediately, but then sometimes it will work for an hour or more just fine, it's very random how long it will work before it blows, but it ALWAYS blows.
The turn signals have Always worked just fine, no problem.

Im going right now to check the brake lights and to try all the suggestions given. I will also take a picture of my fuse box, which has obviously been screwed around with and could also be the problem. So far, the 7 wire harness that starts by the fuse box and goes to the trunk looks fine.
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Old 02-23-2011, 12:55 PM
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Ok, so I unplugged the 7 wire harness next to the fuse box, and the fuse still blew instantly when I pulled the headlight switch out. So for now I'll assume that from the connector on back, the 7 wire harness and bulbs/sockets are ok. Here is a pic (bad cell phone pic) of my fuse box, and yes I know the running lights fuse is blown (i took this right after I blew it). Can anyone tell me which fuses are for what?


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Old 02-23-2011, 01:43 PM
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I forgot to mention, my dash instrument lights and my tachs also shut off when that fuse blows.
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Old 02-23-2011, 03:07 PM
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Here you go, for a lemans but it should be the same
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Old 02-23-2011, 03:16 PM
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Add this to the collection! lol
Passenger Compartment Part 1:



Part 2:

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Old 02-23-2011, 05:15 PM
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Sorry I didnt read the whole thread and I knew I had it.
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Old 02-23-2011, 05:17 PM
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Okay----if you blew a fuse with that rear harness undone, the issue has been narrowed down quite a bit.

Next easy thing to do is to undo the front lamp harness from the fusebox/bulkhead disconnect under the hood.

This would be the harness that runs along the driver inner fender.

turn on the lights and see if the fuse still blows
Possible that there is some bad wiring under the hood that is occaisionally shorting to ground. Not really sure this will work as the headlights and taillights are fed from different sources to the headlamp switch.

I'm gonna guess that there is an issue between the fusebox and the headlight switch----may be the headlight switch causing this.

The brown wire with the white stripe is the feed wire to the HL switch for the taillights-------brown wire with no stripes feeds the lamps out back, and the park lamps in the front.

Green wire is for the instrument lights, this goes thru a rheostat for dimming.

Red wire feed the headlights
Blue (and I have seen yellow) feeds the floor dimmer switch.

The white wire is the ground wire for the dome/courtesy lamps
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