Bartamos,
I think Jim Carter's universal 12volt switch has the thermal circuit breaker,located at the very rear of the switch mechanism,

http://www.oldchevytrucks.com/cart/product.asp?prodid=EL160&i=9764|||||

The breaker is held to the mechanism by the two bolts/leads you see at the very rear. I don't remember where I got the new circuit breaker itself, possibly from an electrical parts place,
Kent


1937 Chevy 1/2 ton
1942 Chevy 1/2 ton
1947 Diamond T Model 509
1951 Chevy 1/2 ton
1950 Chevy COE Model 5700 ~ "Barney" ~ And more pix