I just purchased a 1994 F150. On the #8 fuse, the block is burned, and the "output" wire has left the fuse block. I have taken the fuse block loose enough to find the wire, and it is in bad shape. I am new to these pickups, but not new to auto repair, especially electrically speaking. The #8 fuse is for the speedo, dome lights, radio memory, chime, etc. While I don't mind just running a new power wire for the radio, I would really like the Speedo working. Any suggestions for getting behind the fuse block to trace that wire and come up with a repair strategy? Also, the fuel guage and temp guage on the cluster do not work...could this be related to the speedo fuse being blown?

 

FTE Thread is second one down from the top and may help you.. . Check out post 4 also.

https://www.google.com/search?q=1994...client=gws-wiz

 

Thank you for that! Is there a source for wiring diagrams for these pickups online?

 

Yes. Look down the page I sent and there are diagrams. Hope this helps.

 

Thank you sir! Diagnosing the short is only going to be half the battle...repairing the burned wire/wiring will be phase 2...It looks like a pop top or tin foil job on the the fuse block

 

So after looking at some wiring diagrams, I would like to find Splice S214. I am trying to figure out how much of the wiring is damaged from the fuse block issue. For the time being, I may just run a new fused circuit from the battery to connect the radio/clock circuit and speedo module circuit to see if I can get those items functioning while I chase the rest of the wiring. It looks like also I can isolate the circuit at the headlight switch so I can have dome/courtesy lamp function through the headlight switch, just not the door switches.

 

The third post in this link might help. It's a different year though. https://www.fullsizebronco.com/threa...needed.507074/

 

That is helpful! Thank you sir! Now I have atleast an idea of where to begin.

 

So, I am not sure what is going on with the radio wiring...the fuse box cover says the radio clock/memory is on fuse 8. But with the toastiness on circuit 8 and no fuse, the radio clock/memory has power, and when you look at the schematic for the radio wiring, fuse 8 is nowhere in the diagram. So that is interesting. I pulled the instrument cluster, found the light green/yellow wire feeding battery power to the PSOM, cut it and spliced a fused battery feed to the PSOM, and now the speedo and odometer works! Not sure how long it has been non-functional, but it had 92k on it when it quit working. I also repaired some sketchy wires on the cigar lighter. The driver door courtesy light is also in need of wiring repair. The dome light is missing its light bulb. I am going to give the courtesy lighting circuits a thorough check and make repairs before I attempt powering that circuit! I don't know how to change thread titles, but I think I need to change the title to this thread to "Fun with Fuse 8"!