Electrical - No Brake Light
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Electrical - No Brake Light
First time poster, so apologies if I'm not doing this right. My newly acquired '79 F100 has an electrical gremlin I'm trying to track down. I don't have a brake light at passenger rear lens. Driver's side functions properly. I have running light and turn signal, but no brake on passenger side. I've chased the wire all the way to the cab and have yet to find the issue(green wire per diagram). Figured I'd ask to see if anyone else has ran into this before I keep peeling back the layers. Any information is appreciated. Thanks.
Fleet Mechanic
Joined: Sep 2014
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From: NE Texas
Have you checked whether you actually are getting voltage to the rear right? A test light would show you if you are getting juice when the brakes are depressed. Also check the ground through the socket, it is quite common for the socket to look good but have a poor or nonexistent ground. Sockets are cheap.
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I had no voltage at the bulb with a test light. I checked at the plug underneath the bumper and could get a very faint response from the test light, but no where near what the driver's side produced. This led me to believe the issue was further upstream. I actually replaced the ground wires for the bulb at the housing. I didn't check the actual socket however, so I'll check there also.
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