Originally Posted by DavidSo
I'm curious. Have you actually seen this yourself on a 12V system? I haven't. Usually you just end up with an open. I've seen similar on a 220V AC circuit because the voltage was sufficient to create an arc across a corroded contact. I guess it could happen on 12V, but it seems less likely. If you have first hand knowledge I'd like to hear
He may not have, but I have. Both 120Volt systems, and 12 volt systems.
There was a recall recently because of a defective switch I believe. High resistance and high current = high heat.
Now something was mentioned about charging current from the tow. Lets see, about 12 ' of wire and maybe 3 to 5 amps of charge current which drops down about a bit. The difference between wire gauges, voltage drops, and the charge on the house battery
If your battery
is a sealed battery
a smaller wire gauge might actually improve the life of the battery by not charging too fast.