sounds like you need to start with rewiring the truck, and checking the function of the switch .... and maybe getting a manual, which can be found here

Bill


Moved over to the Passing Lane

"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir
"When we tug a single thing on an old truck, we find it falls off" ~ me
Some TF series details & TF heater pics