Blinker Issue

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May 10, 2015 | 10:07 PM

77_f250_custom

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Blinker Issue

Hey guys. Having an issue with my blinkers. they haven't worked at all for awhile, then today I hit a bump on a gravel road and when I showed the truck to my brother in law, they started working. Later I was putting one socket back in the lens (didn't realize it wasn't in there, because the blinkers haven't worked since I've owned it). Left that blinker on so I could find the socket and see what I was doing. As I'm putting the lens back on, all the sudden no blinker, and my brake lights don't work...Thoughts? I was thinking the ground in the blinker switch/in the column, but I'm at a loss...

May 10, 2015 | 10:46 PM

bkaul

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From: Knoxville, TN

The grounds are at the sockets in these - switch is just the hot side.

Brake light switch is on the pedal, not in the column, but I can't recall if they pull from a common fuse or not...

May 10, 2015 | 11:48 PM

77_f250_custom

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I thought I read that the brake lights run through the blinker switch so they can be made to flash.. or is that taillights?

May 11, 2015 | 07:57 AM

bkaul

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From: Knoxville, TN

Hmm ... now that you mention that, it is possible; I'd have to look at a wiring diagram to see how that was routed. The brake lights and turn signals do use the same bulbs, but I'm not sure how it's wired up to where each switch can turn them on w/o backfeeding other bulbs.

Diagrams can be found here:
1973-1979 Ford Truck Wiring Diagrams & Schematics - FORDification.net

May 11, 2015 | 08:30 AM

NumberDummy

Ford Parts Specialist

Joined: Nov 2006

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From: Simi Valley, CA

Styleside tail lamps and the sockets are the same: 1974 F100/350 from serial number T80,001 - 1975/79 F100/350 - 1975/91 Econoline - 1978/79 Bronco.

May 11, 2015 | 09:01 AM

ZarK-eh

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From: like subarctic, brrr man!

What about upgrading to newer style bulb sockets?

I hate piles of trouble with the ones on my '78 and was able to splice and solder in ones from some 80's or 90's pickup truck. They fit the bulb, and the lens holes! And the wiring is sealed inside by white grease so it never has problems with corrosion like the originals do.

May 11, 2015 | 10:27 AM

77_f250_custom

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Thats a good idea. I thought about putting in newer sockets. How is the wiring sealed in on the old style that makes them so prone to failure?

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May 12, 2015 | 06:00 PM

NumberDummy

Ford Parts Specialist

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From: Simi Valley, CA

Quote:

Originally Posted by ZarK-eh

What about upgrading to newer style bulb sockets?

Buy 'em from Ford and that's what you'll get, newer bulb sockets, because Ford replaced/updated the original part numbers.

F4UZ-13B765-A (replaced C8OZ-13711-A & B ~ F3XY-13B765-B) .. Instrument Cluster Bulb Socket-also used for A/T Selector Dial / Available from Ford: MSRP: $2.32 each.

Applications: 1970/94 Econoline / 1970/96 F100/350 / 1978/96 Bronco / 1986/97 Aerostar / 1989/90 Bronco II / 1989/2001 Ranger / 1991/2003 Explorer / 1999/2003 Windstar.

And, myriad 1968/90's FoMoCo Passenger Cars!