Some Alternators are more forgiving than others and the Motorola is not forgiving at all.
I have a P30 and I believe it came with break before make as the PO
had the diodes replaced regularly, I have all of his repair data. When I
was redoing the wiring I noticed that there's a cutout for the batt switch
and it was replaced. I have checked it and it is a make before break. I think he
thought either the switch or bad or a break before make. When I had the motorola alt I switched while the engine was running, didn't have any issues.
I have now replaced the alt with the 55A and I have also switched while running with no issues.
I don't switch them often, I keep it on one battery and use the other as a emergency in case the one drains down. I did have to switch it last year
when the new walmart battery died at the end of season
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