Jeff - that would have been an add on - either for a factory accessory or something a po patched in - the switch has a built-in fuse - check the "next page" from that link for a wiring diagram

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