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Yep, and most of those large rotary switches use a cam or ramp to actuate a large bussbar and push it against the contacts. If I read your initial post, you thought it was off and rotated it to on, when in actuality it was on and you rotated it to off. What I think may have happened is that...

Now what you experienced may have been a latent switch, IE, the switch didn’t fully open and you got power thru it until you tried to pull any significant current…

Yea the early,A1s didn‘t have them. That remote disconnect is what the LBCD would use to disconnect the batts. So if you don‘t have that, as general said, you probably have a polarity protection device. You have the circuit board power panel and the 3126? I call these an A0.5:)

The caps are there to catch the voltage spike caused when the LBCD disconnects the batteries(load) from the alternator at full output… in my experience this is usually considered a big no-no, as that spike can fry components until the regulator can get it under control, but some bright light...