1978 F-250 Cab Wiring Issue? - Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars
Ford F-100 | Ford F-150 | Ford F-250 | Ford F-350 | Ford Super Duty | Ford Diesel Forum for discussion of the Ford F100, F150, F250, F350, Superduty and Diesel trucks.

 
LinkBack Thread Tools Display Modes
post #1 of 7 (permalink) Old 12-25-11, 11:43 PM Thread Starter
Registered User
 
Join Date: Dec 2011
Posts: 9
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.

Jonesey1 is offline  
Sponsored Links
Advertisement
 
post #2 of 7 (permalink) Old 12-26-11, 07:50 AM
Administrator
 
Join Date: Sep 2006
Location: Arkansas
Posts: 6,805
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.
jwko is offline  
post #3 of 7 (permalink) Old 12-26-11, 09:56 AM Thread Starter
Registered User
 
Join Date: Dec 2011
Posts: 9
Re: 1978 F-250 Cab Wiring Issue?

Quote:
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.
Jonesey1 is offline  
post #4 of 7 (permalink) Old 12-26-11, 10:46 AM
Administrator
 
Join Date: Sep 2006
Location: Arkansas
Posts: 6,805
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.
jwko is offline  
post #5 of 7 (permalink) Old 12-26-11, 05:49 PM
2002 F150 XLT
 
Bert's Avatar
 
Join Date: Nov 2008
Location: Oregon
Posts: 10,312
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.

Bert
Bert is offline  
post #6 of 7 (permalink) Old 12-26-11, 07:42 PM Thread Starter
Registered User
 
Join Date: Dec 2011
Posts: 9
Re: 1978 F-250 Cab Wiring Issue?

Thanks for help and support. Happy New Year to you and yours.
Jonesey1 is offline  
post #7 of 7 (permalink) Old 12-26-11, 07:44 PM Thread Starter
Registered User
 
Join Date: Dec 2011
Posts: 9
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
Jonesey1 is offline  
Sponsored Links
Advertisement
 
Reply

  Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars > Ford Trucks | Utes | Vans |SUVs | Crossovers > Ford F-100 | Ford F-150 | Ford F-250 | Ford F-350 | Ford Super Duty | Ford Diesel


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome