It's a 92 I just bought.
installed new headlights but no power to them.
All other lights work.
Switch seems to work fine, and dimmer works too.
Dont see fuse for lights in the fuse block.
Is there a fuse or relay somewhere that i'm overlooking or in a secret place??
Or a ground somewhere, I need to check??
I'll be out checking...........be back in a while to check for reply.
Thanks!

 

Sounds like the switch is burnt up. Have you pulled it out and looked at it?

 

It works for everything else, is it possible that it just wont work for headlights?
What's the trick to getting the switch out.
Seems like the **** does not come off.
Don't want to break something!
Thanks

Update: My fiance contorted her body up under there and found the little release button.
And there is one prong that looks like it may have fried.
Who's most likely to have one in stock? Napa?

 

Pretty common to burn out a switch. They have several circuts going through them and it is easy to burn out just one.

Put a new switch in and then look in the "sticky" for the Headlight relay mod. Relay the Head lights and take the load off the switch and undersized factory wiring.

 

on the bottom of the witch you'll see a little button like deal.. Pull the switch out as far as it will go and then push the little button with a screwdriver or whatever it might be and it will pull right out... The the rest should be pretty easy

 

The Light Switch has an internal Self Resetting Circuit Breaker that only supplies the Headlamps.

This is why that your headlamps can go out while all of the rest of the lights remain on.

Sometimes if you add to many gauges and have the lights on the dimmer or drive around with the dash lights dimmed the wirewound rheostat that dims the lights when you turn the **** will overheat and cause the circuit breaker to prematurely trip and turn your headlights off.

Dim your dash lights for a while and then feel the dash behind the Light Switch **** and see if it feels warm, it can get real hot.

Do your headlights come on if you pull back into the Flash position of the High Beam switch?

The Flash circuit of the headlamps are a separate circuit and is not controlled by the headlamp switch but is supplied from the same internal circuit breaker.

If the Flash does work but the headlights don’t work when the **** is pulled out then it is probably the switch is bad.

It could also be the Dimmer Switch but I have hardly ever seen this to be the problem.

The lighting circuit on these trucks were poorly designed and tend to get worse with age especially if you try to fix them by installing brighter lamps like Silver Stars they need more current to drive them and the wiring cannot provide it.

All of the current for both of the Low Beam headlamps are supplied through a 16-gauge wire from the dimmer switch to the sockets, they did a little better with the High Beams with a 14-gauge wire but would you believe the grounds are only 20-gauge.

This is the reason for the voltage drop at the headlight socket.

After you replace your headlight switch do yourself a favor and install Headlight Relays to get some really bright lights and never burn out another Light Switch again.

https://www.dieseltruckresource.com/...d.php?t=176263

Jim