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Old 07-30-2017, 02:14 PM   #1
the pinstriper
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Wiring help

Hi guys I'm after some help with the wiring in my 67

I purchased the truck with very little back ground on it, I was told sometimes it doesn't turn off. I followed a guide I found on here to try narrow the problem down. I found when turning the key off and tacking it out the only way to turn the truck off was to pull the head light fuse out. I had a good rummage and see the truck has had a new full wiring loom install at some point. The fuse board is still a glass fuse type. There was an added wire off the fuse board to make the lights live, which I pulled out along with a heap of other scotch locks. One of which went into the plug to the rear lights.

I have un taped the entire loom in the bay and found a fuse off of the junction block that was blown on the 18b line (cross referencing to the stock loom diagram I have printed out) with disconnecting the hash of wires and relaxing this fuse I now have head lights, plus a truck that turns on and off.

How ever I don't have any tail lights now, from memory there was a scotch lock in the sensor unit on the pedal, I'm assuming this went to the light loom on the bulk head for the rear lights. Again at the rear of the truck was a hash of wiring with in the new loom kit, this was for a tow connection so I took that out and re soldered new wires in. My wiring knowledge is limited but they left good amounts of the stock coloured wires about I just had to reconnect these back up.

My hazards work on the front but no flashing at the rear, but no indicators at the front or rear.

No horn

No fuel gauge

I replaced the head light switch thinking that this was the issue but clearly isn't, when I pull the switch out these wires are live
First pull blue 14lbl
Second pull blue 14lbl
3rd pull is purple in my loom but on the stock diagram its 14 brown which turns the head lights on.

I would have thought this new loom someone has installed would work with out having to add wires in. I have the entire loom in the truck but pulled out. I have inspected the wires and nothing is burnt out, there has been a lot of heat in the ignition barrel but no wires are touching. I have a new unit coming to replace this.

Any help would be amazing as I'm about to give up with it, as I said I have very little wiring knowledge so please bare with me.

Thanks in advance Joe
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Old 08-04-2017, 08:40 AM   #2
Moose Monkey
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Re: Wiring help

Photos of everything please
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Old 08-04-2017, 10:44 AM   #3
VetteVet
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Re: Wiring help

You are in the right place for help and we'll get you going quickly.
Follow the advice of the two guys above and read and study this thread.

http://67-72chevytrucks.com/vboard/s...ad.php?t=74124

A lot of time fixing one thing will fix others at the same time, so you don't run in circles.

The small black wire with the blown fuse is for the battery gauge in the dash and ther is another one on the main junction where the alternator and battery wires meet the voltage regulator and cab power wires. That is all detailed in the thread I posted.

Someone has used the headlights fuse to power something which is tied to the ignition.
It seems you have sorted that out.

The tail lights harness is only four wires and two of them come off the turn signal harness. Dark green and yellow are the two for left and right turn, a brown wire from the headlight switch is the power for the tail lights and front parking lights.
The front turn signal lights also come off the turn signal switch, They are light blue and dark blue.

The horn and the hazards not working may be turn signal and steering column problems.

Again, read and follow the thread diagrams and it will help you sort the wiring out.

post back with questions as you go.
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Old 08-07-2017, 11:20 AM   #4
lsversaw
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Re: Wiring help

VetteVet, when I click your link it leads to a thread on ball joints.
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Old 08-07-2017, 12:09 PM   #5
VetteVet
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Re: Wiring help

My apologies, I copied the link right off this page but I didn't check it before I posted, which I usually do.
Here is the correct thread, which I checked.

http://67-72chevytrucks.com/vboard/s...d.php?t=741245

Thread title by DJMLambert-fuse panel detailed description or diagram
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