1995 f150 5L, automatic, 4WD. crawling under the truck I think I found the switch, but can't be sure (i'm using the Chilton book). I know the bulbs work. I'm strapped for cash, so instead of replacing the switch, I was thinking of putting a jumper around it, connected to a toggle switch I'll put in the cab. So, I need to find the hot and ground connections to cut in my new wires, and run them to the cab toggle.
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I didn't find a location for the backup light switch,
But found the following on Autozone.com:
Backup Light Switch Operation: An open switch that prevents voltage from being applied to the backup lights until the vehicle is put in reverse. Putting the vehicle in reverse closes the contact and applies power to the rear back-up lights.
Check under the dash or somewhere near the steering column if you have a column shifter. If the shifter closes or opens the backup light switch mechanically, one should be able to trace the cable and mechanisms that turn a cam that connects to the backup light switch, somehow.
May have to disassemble the steering column area to see it.
You would notice somthing if the transfer case engaged, even if the hubs did not. The first thing I'd do, before crawling in the snow is to stop by my mechanics or an autozone and have the OBDII
scanner hooked up to see if any DTC codes poped. A 4wd related code may not set the mil light
on the dash. There is a 4wd ctrl. module and a few switchs+solnoids located under the truck under
the hood and under the dash that are 4wd related and if there is a trouble code it can narrow the
search greatly. In the meantime you can check these fuses that are either directly or in directly
related to the 4wd #45 #19 #27 #111 Hope this helps.
The "reverse switch" or backup switch is part of the DTR ( Digital Transmission Range Sensor ) on the driver's side of the trans, about half way on the trans. This has ( if memory serves me correctly ) 14 wires from it, as the neutral switch ( starting ) and reverse lamps are only part of the operation ( other parts include the SOTF for the 4x4 ).
Brake light switch is probably bad. Had the same problem on my truck. This is located just above the brake pedal. If you crawl under dash area with a flashlight and push the brake by hand you should be able to see the brakeswitch being actuated. On my F150 it was a 5 minute job.