you have the heater and signals on the same fuse??

the heater should have it's own wire direct to a power source, and should do fine with a 10 amp fuse - if it's blowing a 20a I'd say something is wrong with the motor or switch

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