On every weehicle I have owned, when I plug in the block heater when it's minus freezemeassoff makes noise that I can hear when I listen closely. Not on Mum's new 300. I thought I might have heard a faint "ping" or two, but no real indication the block heater is working. I was just out freezing my fingers while testing the continuity (ok) and the supply (ok). Is this typical of Chryslers?

BTW... the last one she had was a Cirrus and it had a block heater and battery warmer... that had to be replaced/rewired three times in 8 years with less than 30k on it.

Spaw! Get yer ass back here if someone else can't comment.