Light shorting help? With pics. Please Advise~

[TheEskimo]

As far as checking for a ground, I use a test light and connect it to a known hot wire, then just poke around for ground to make sure it is all good.

I got lucky when I found mine as I was actually looking for bad wires and, when I went to remove the rear light the screw gounded and everything worked right. Just had to make sure they all were grounding properly then.

Glad to hear it's working proplery now for you.

[Davep]

That was great advice! I have the same prob with my 71 F100, so I.l do the same fix!

[fordguy63080]

When you say flashing on and off, I assume that's a random thing?

Well, it just started one day, then I thought I fixed it, then it started again? I think it was either because I have a short somewhere, when the truck would move something either came loose, or some wires would touch? Or, something like the switch was getting hot. That is the reason that I thought it was fixed, maybe something was cooling off, then as soon as it got hot again it would start to act up again? I hate wiring!

........My nephew had the same problem on his 71 after about an hour of troubleshooting all it was,was the dimmer switch,Just a thought?

[71PA_Highboy]

And to top it all off, the switch is still not always up to the task.

After fixing the grounds, I have ALWAYS done 1 of 2 things...
1. Relay'ed the circuit.
2. Replaced the stock switch with a Motorcraft from a 69 Ford with 4 headlights (doesn't really matter, but the mustang one has an odd spacer that will require some extra work).

The extra current draw of the 4 headlights required a higher amperage CB in the switch....

The factory designed headlight harness just isn't up to the task after 30+ years.



Eric