Good point regarding electronics requiring constant voltage; I hadn't thought of that. Not an issue on my 49. I'm in the middle of an engine swap and alternator conversion right now. I'm going with a master cutoff that clamps onto the negative battery post. Under $10 on AMAZON. I'm also mounting a 50 amp manual reset circuit breaker on the firewall, where the regulator was removed, between the battery and the ammeter to protect the under dash wiring and ammeter. It's pretty much impossible to find an alternator under 50 amps nowadays. The breaker can be tripped manually to serve the same purpose as a positive side master switch. If I ever do add something requiring constant voltage I can wire it to battery side of the breaker. When I want to swing wrenches without worrying about arcs-n-sparks I can twist the switch on the battery post.

1949 3600 w/ 57 235