I've never heard of that one. One of the tests I've used for years to find
out if there is a charging problem (when a volt meter is not available) is to
disconnect the ground terminal from the battery while the engine is running.
If the alternator is charging the car will continue to run, if not - car dies.
I would be very careful not to disconnect the hot terminal until the ground is
disconnected, but that goes for a car that is running or not running. The
sparks are quite impressive if you ground your wrench to the body while
loosening up the hot terminal.
As for the cutoff switch, I assume that it is hooked to the ground terminal.
If so, it would be my guess that there is something crossing to ground that
bypasses the switch. In a Spit I would look at the side hood-support to
battery clearance. I'm not sure what would do it in a TR-3.
Thanks,
Paul Mostrom
'77 Spitfire 1500
'80 Ford F-100 (Triumph Support Vehicle)
'Black holes, where God divided by zero......'
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