Ken Heaton, Cape Breton Island, Nova Scotia wrote:


Probably the easiest way to test to see if your battery switch is a
make before break type is to switch on a light you can see easily from
the battery switch then slowly move the battery switch from 1 to both
to 2 and back a few times and watch to see if the light flickers or
goes out as you move the switch. Do this with the engine off of
course. If there is a flicker your switch may be worn. If the light
goes out completely at any time in any position other than off you have
the type of switch (NOT make before break) that can fry your alternator
diodes.

Great answer! Common sense prevails.

Gary