Hi folks, I’m in Scotland and have an ‘87 F150. Previous owner removed EFI system, cruise, air con seemingly with an axe. I have a good few harnesses lying around under the hood not connected to anything. The truck runs fine but a niggle I have is my volt meter doesn’t work. All other gauges in the cluster work fine. Now I know a volt meter is normally connected to a keyed live and a ground but I have no idea which wires under the hood were once for the volt meter. I’ve had the cluster out and seen the 14 wire harness there but have no idea what they connect to at the other end. Any help would be greatly appreciated.

 

From Haynes

There are links to manuals at the third post at this thread https://www.fullsizebronco.com/threa...iagram.526534/

 

Thanks very much Soup Bean, a mine of information there 👍

 

Geo
Those connectors behind the cluster tend to be unique, by that I mean each plug will only fit one socket, should be obvious which is which - sometimes color-coordinated as well...

As far as circuit tracing, the schematic will be your friend

https://www.f150forum.com/f38/voltme...estion-491978/

Good luck

 

Cheers Apple, the problem is that so much has been hacked off the truck that there’s nothing to plug into, just loose plugs coming from the round wiring harness. As I said, it runs, I love it, but the voltmeter just annoys me 😁

 

My guess is a bad gauge. I had it happen before on my 87.