Can anyone help on a 1980 (non computer truck) fan setting that does not work
on high ? I saw a post about high speed is direct not controlled by the resistor ?
Thanks

 

*Moved to a new thread in the Fullsize Tech section* - The thread you originally posted in was based on the 1st generation s-series and that information really is not applicable to your vehicle.

I don't have access to my references at the moment. In the meantime, maybe someone else does.

Typically, high speed is a direct connection to battery voltage. If you do not have battery voltage at the fan, work your way back to the fan speed switch.

 

had the same problem on my car replaced the resistor works now