![]() The following information is reproduced directly from the 1970 Ford Body Builder's Layout book (Vol. ![]() Here is some information on adding lights that The Fordification site has listed at the bottom of this page Īdding Lights or Electrical Devices to Ford Light-Duty Trucks You could try a new light switch as the circuit breaker in it could be getting tired, but the best thing to do would be to wire a relay in for the trailer lights. The wiring on these old trucks is just barely enough for the truck without adding any other lights to it. I have noted this in the diagram as well.Īs for the problem with the lights flashing with the trailer lights on. To fix this you would need to add a Diode in the brake wire between the TSS and the Brake controller, as Mike58sacco said above. So anytime you use the Emergency lights it will activate the trailer brakes. See the attached diagram at wires 810 and 810A where they go into the TSS. The Emergency lights and the brake lights are connected to the Turn Signal Switch (TSS) at the same point. This tells the TBC to activate the trailer brakes and then there is an inertia sensor in the TBC that tells how hard to apply the brakes (along with adjustments). The electronic Trailer Brake Controllers (TBC) have a wire that is hooked to the brake lights. Mike58sacco is correct, this is somewhat normal.
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