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Old 12-25-2011, 23:43   #1 (permalink)
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1978 F-250 Cab Wiring Issue?

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.
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Old 12-26-2011, 07:50   #2 (permalink)
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Re: 1978 F-250 Cab Wiring Issue?

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.
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Old 12-26-2011, 09:56   #3 (permalink)
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Re: 1978 F-250 Cab Wiring Issue?

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Originally Posted by jwko View Post
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.
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Old 12-26-2011, 10:46   #4 (permalink)
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Re: 1978 F-250 Cab Wiring Issue?

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.
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Old 12-26-2011, 17:49   #5 (permalink)
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Re: 1978 F-250 Cab Wiring Issue?

The headlight switch has a rheostat that runs the cluster lights and also a connection for the dome lights. See what you find there.
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Old 12-26-2011, 19:42   #6 (permalink)
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Re: 1978 F-250 Cab Wiring Issue?

Thanks for help and support. Happy New Year to you and yours.
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Old 12-26-2011, 19:44   #7 (permalink)
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Re: 1978 F-250 Cab Wiring Issue?

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
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