F-150 troubleshooter challenge
 

I recently aquired have a 93 Ford F-150 - 4.9l 6 cyl - straight gear. The perfect truck for me.

Last week while driving along smoke started coming from under the dash and it cut-off, I drifted to the side of the road. No smoke from under the hood.

I had to have it towed home and this weekend I started troubleshooting to see if I could locate the problem.

The engine will turn over with the starter but it will not start.

The fuel pump will not come on when the switch is turned on.

I have looked extensively under the dash and can't find any sign of wire burn.
I removed the entire instrument cluster and flipped it up on the dash - there was no sign of wire burn.
I removed the fuse block on the D/S and pulled it out as far as I could, inspected the wiring as well as I could - no damage.
I pulled out the head light switch and noticed that the coil for dash dimmer had come apart and hanging. There was discoloration from sparking I assume but thats all. I replaced the switch. I dont think this was the cause of the smoke because I have tried to crank since and get the same no fuel pump as before.

Under the hood I have the "on all the time voltage" on both the ignition control relay and fuel pump relay.

I jumped the fuel pump and it came on fine.

I get 12 volts at the fuel pump relay when I turn the switch on but it does not time out like it should. I tried a new fuel pump relay with no luck.

Anyway, I've reached my limit, any suggestions?

Welcome to the site

Welcome to the Forum!

Thanks, glad to be here.