Thanks! So not enough to worry about.
BTW, the thermal switch in this case seems to be part of a "Low Ambient Heater kit, that goes in the back cooling "chimney" somehow in the Goolge info. (I will edit the OP for that, sorry)
It is a resistance heater. Has +12v black wire through a 3a fuse, and a -12v BR wire though a thermal switch. The manual just says it is for cold weather to help with heating. It might also be whatever an ARP is, I am not clear on all that. I don't have one AFAIK.
641.3R What does the R stand for? Can't find a list of options that might refer to.
