is this the GMC? add-on type signals or factory? is there a fuse in the circuit? if you had 2 switches go bad in different ways it might be defective switches or as likely, the installation has some other problem

if the connections 'overheat' it's a poor connection, not an 'under-rated' switch .... watts = heat, there shouldn't be any watts in the switch terminals unless there's poor contact

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