Thread: 1978 F150 brake light issues

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Turtle, it has been my experience that once a wiring harness begins going South, it's best to yank the whole mess out and completely re-wire it with a whole new system. My very best advice to you is to buy this FACTORY electrical schematic from Faxon and begin purchasing components.
1978 Ford F100 F150 F250 F350 Foldout Wiring Diagram Original
It's also possible that one of the aftermarket suppliers can sell you a complete replacement wiring harness that you could plug and play. Here's a roster of manufacturers....
Automotive Wiring Harnesses

and some other websites....
CLASSIC & MUSCLE CAR WIRING HARNESSES and ELECTRICAL PRODUCTS
Wire Harness Manufacturer, Wire Harness Assembly,Design,Electro-Mechanical,Prototype,Custom Manufacturing GA
https://www.ronfrancis.com/
Painless Performance
American Autowire: Wiring Harnesses, Accessories, & Parts for GM Restoration, Modified Restoration & Custom Street Rod

and let's not forget my number 1 pet peeve, lack of proper grounds. It is not possible to have too many grounds on a vehicle, so grind down to bare metal and ground the motor to the frame and the frame to the body with new ground cables.....
9" from NAPA...http://www.napaonline.com/Catalog/Ca...577_0459880039
13" from NAPA...http://www.napaonline.com/Catalog/Ca...559_0187600146
18" from NAPA...http://www.napaonline.com/Catalog/Ca...465_0459879965

When installing grounds, use star washers that dig into the base material of both parts and lock everything together....
http://www.randyray.com/TMC/images/R...StarWasher.jpg

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