Put a heavy duty switch in my 49 years ago. Each time I put the truck in the garage I turn it off. I have mine running through the Positive cable off the battery.
My neighbour has a POS 74 Land Cruiser and has something draining his battery. I suggested a trace. Instead he bought a cut-off switch and said he is going to install it on the Negative cable. I asked why and he said that the truck has two 24V batteries, one for accessories and the other to start it.
I looked online about which terminal/cable should be attached to the switch. Most said POS but a few said NEG with valid reasons. Typical Google answer I guess!


1949 Chevy 1/2-Ton
"Sedgewick"
In the Gallery
1989 Caprice