1978 F-250 Cab Wiring Issue? - Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars

Jonesey1 · 12-25-2011, 23:43

The instrument cluster lights as well as the dome light in the cab of my 1978 F-250 do not work. I have replaced the bulbs but to no avail. could this be a wiring issue? If so any help or suggestions as how to further troubleshoot or fix this issue would be greatly appreciated.

**jwko** · 12-26-2011, 07:50

Do you tail lights (parking lights) work when the headlight switch is pulled out one notch? Seems like these were all on the same circuit if I remember correctly. Could be the fuse.

Jonesey1 · 12-26-2011, 09:56

Quote:

Originally Posted by jwko

Do you tail lights (parking lights) work when the headlight switch is pulled out one notch? Seems like these were all on the same circuit if I remember correctly. Could be the fuse.

Yes everything else seems to be working okay. Which fuse would that be? Fuses looked okay, unless I overlooked something. Thinking about replacing entire fuse block. Previous owner let the truck sit for 3 years. Found some moisture/mildew areas. Any and all help/suggestions will be greatly appreciated.

**jwko** · 12-26-2011, 10:46

I can't seem to locate a fuse diagram for this model. If you have a multi meter, test each pulled fuse using the ohm setting. Sometimes a fuse will look OK but will be bad. Also the dash lights and dome light are controlled through the headlight switch, it could be bad as well.

**Bert** · 12-26-2011, 17:49

The headlight switch has a rheostat that runs the cluster lights and also a connection for the dome lights. See what you find there.

Jonesey1 · 12-26-2011, 19:42

Thanks for help and support. Happy New Year to you and yours.

Jonesey1 · 12-26-2011, 19:44

New Headlight Switch already installed but, I'll go back with my ohm meter and check those fuses. You're are great help, Sir. Thank you