Anyone else have a grid heater relay fry on them? Just got my truck back from the dealer - they checked out the grid heater - O.K., but one of the relays that feeds it was toast. Took a few days for them to get a new relay and harness, so I'm guessing this is an unusual failure????

 

Can't say I ever heard of one of those failing. At least they found the problem and didn't say it's operating normaly or we can't duplicate it.