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Re: Back up lights and brake lights?
On the backup light. Check to see if you have power to the light with a test light.
You have to have the key on and the truck in reverse. Make sure the park brake is on or the truck is on flat level ground.
You should have power to the contact in the socket.
If you have power there check the ground for that socket.
On these trucks (I drive a 71 daily) the grounds for the lights are quite often the problem.
If there is no power to the socket, backtrack to the connection where that wire ties into the wire to the other light.
On the brake light switch, it needs to be adjusted so that the brake pedal lever just turns the switch off when your foot is off the brake. I think I would be of the notion that the switch may be going bad. The are fairly inexpensive and available at most parts houses.
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