wiring diagram

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Dec 31, 1969 | 06:00 PM

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wiring diagram

Nov 6, 2001 | 07:35 PM

rumblinbass

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Joined: Apr 2001

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wiring diagram

I recently installed power steering (a success!) and a 1972 column in my 1965 f-100. The column fit perfectly and with a little modification I got the turn signals working. I now have a problem that I never had before, the brake lights don't work (and no, it's not the bulbs).
How does the brake light switch work? It is screwed into the top of the master cylinder and has 2 posts sticking out of it. Does it simply have contacts inside that make when pressure is exerted inside the cylinder by depressing the pedal? How can I check if the switch is any good? My thinking is that I should be able to read continuity across the 2 posts when the brake pedal is depressed. Am I thinking correctly?

Any help is greatly appreciated.

Thanks,
Trevor Muzzy

Nov 6, 2001 | 09:07 PM

jowilker

Fleet Owner

Joined: Jun 1999

Posts: 24,552

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From: Creedmoor, North Carolina

wiring diagram

Trever, Adding power steering shouldn't have anything to do with your brake lights unless you added disc brakes as well. It is a pressure switch, and to test it you need a probe light. Turn the ignition switch to the on pos. One of the wires will become hot, once the pressure is applied the switch closes and allowes current to pass through, and the rear lamps should light. :-)
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Nov 7, 2001 | 10:51 AM

6t6merc

Cargo Master

Joined: Apr 2001

Posts: 2,697

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From: Vancouver

wiring diagram

But, remember that the current to the brake lights goes through the turn signal switch.
Eric

Nov 7, 2001 | 11:37 AM

William

Logistics Pro

Joined: Feb 2000

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From: Sun River St. George

wiring diagram

Trevor, Pull the two wires off the stop switch and jump them togeather. If the stop lights come on replace the switch. If not post back. Brake lights are really important. Don't risk your truck by driving without them.
William in Atlanta

Nov 7, 2001 | 06:06 PM

rumblinbass

Freshman User

Joined: Apr 2001

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wiring diagram

When I touched the wires together and the ignition was on, the lights do not light.

>But, remember that the current to the brake lights goes through >the turn signal switch.
> -Eric

I didn't know the brake light wire ran through the switch...I think that explains my problem.

To use the column from the 1972 truck in my 1965 I had to snip the old plugs off the old column and since the pin configuration of the two column's harnesses is different and I had to figure out which wires went to what but I must have made a mistake. My turn signals work fine (front and back) but now I have no stop lights or rear emergency flashers. It also appears that my new column has one more wire than the original in the harness.

Does anybody have any idea what I should do? Should I just stop asking questions and buy a wiring diagram?

The column I installed also has a hazard switch. Is there a way to wire in that switch in addition to the dash mounted one and have them both be functional?

Thanks,
Trevor

Nov 7, 2001 | 06:33 PM

66ranger

Elder User

Joined: Dec 2000

Posts: 632

Likes: 8

wiring diagram

Try the old fashioned way: run a tempory wire from the plus terminal of battery to one side of switch, run another temp wire from neg. terminal or ground to other side of brake light switch.Your brake lights will light up when current runs thru. This will mean brake light switch and all brake & rear light parts are good, the problem is in the wiring from your new column to your 65. I put a 71 column in my 66 and had to redo my original connections between them. I tried to hook up same to same, it didn't work, redid it a few times for success. Later, I will get a flashlight and go see what I did and let you know..

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Nov 8, 2001 | 06:55 AM

William

Logistics Pro

Joined: Feb 2000

Posts: 3,565

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From: Sun River St. George

wiring diagram

Trevor, Brake lights have a constant hot power supply. So one of the two wires on your switch must be hot as long as the battery is charged. If not check the fuse. Run a hot from the battery + post to the wires at the switch, one of these should make the brake lights come on. Then connect the hot from the battery to the switch, reconnect the wire to the brake lights, step on the brakes. If the brake lights come on, look for a disconnect in the hot wire from the fuse block through the 4 way switch and out to the stop light switch. On my truck this is a red wire with a blue stripe. I had a similiar problem, replaced the TS switch and the 4 way switch, also built a new wiring harness to the rear of the truck, still no joy....then replaced the short wiring harness from the 4 way switch to the TS switch harness and every thing worked. By the way one of the old TS switches will work in your column.
William in Atlanta