The BSA is different, as you know, because or the positive ground.
I wired the charger the usual way, and worked as usual
But last week I forgot to disconnect it before starting the bike, That move destroyed the charger.
Also the battery stopped accepting a charge.
I'm never had issues with my battery
tender. It charges like all other vehicles, shuts off when complete, doesn't harm anything.
The only gotcha is the little plastic cap over the battery
Tender connector that's hooked to my battery
. The exposed pin is Bat Neg which isn't an issue on a negative ground vehicle. On the BSA however, I always make sure I replace that cap when I disconnect the tender, lest it should touch the frame.