Don't have no dash lights on a 92 ranger. Cant find a good wiring diagram. Anybody have a copy of one. Check all the fuses they are good.

Thanks
Marc

 

Don't have a 1992 diagram, but Ford used Light Blue/red stripe wires for dash lights for 3 decades

Main light switch has the dimmer inside it, rotate ****

Dash light 12volts shares connection with Brown Parking light wires which have a fuse, so when park lights(or head lights) are on 12v goes to Dimmer wheel/**** inside the switch

The light blue wire on the main light switch will have 12v with Parking lights on, or less depending on dimmer setting
Then that wire "may" run another fuse in the cab fuse box, maybe 5amp, then out to all the dash lights, including instrument cluster, on a light blue/red striped wire

So you would need to UNHOOK THE BATTERY FIRST !!!! main light switch is connected DIRECTLY to battery
Then pull out the main light switch
Then plug switch back in
Then hook battery back up

With park lights ON test light blue wire for 12v and adjust the dimmer while testing to make sure voltage is going up and down
If no Volts then main light switch is bad, well the dimmer part

If you are getting variable voltage then have another look at the fuses, 15amp and lower, if possible test each with OHM meter, "looks" can be deceiving

If its just the instrument cluster lights then pull it out and test the light blue wire with park lights ON, if you have 3 to 12v(dimmer) then cluster has burned out bulbs or bad trace wiring inside it

 

So I tested the light blue wire and it has a constant 12 volts regardless of position of dimmer control. Switch bad?

 

Well the instrument lights should be on all the time if that was the case?
Does it have 12v even with Park Lights off?

 

12volts only when switch is pulled out, headlamps on.

 

Well then yes, it probably is the main light switch then, if you don't see variable volts when turning the ****

But doesn't explain why lights in cluster are not on, if they are getting 12volts