I would also be interested in comments about the second part of Rob's question. For my disconnect switches, I have installed them on the battery ground with the intent to isolated the battery from draining. However this would allow the alternator to keep the engine running when disconnected. I have worried that the alternator's voltage regulator could swing without the battery capacitance. I would THINK if the intent were a energy isolation to kill the car/engine, the switch should be on the positive feed (with the alternator still connected to the battery). Joe -----Original Message----- From: DeTomaso [mailto:detomaso-bounces@server.detomasolist.com] On Behalf Of Rob Dumoulin Sent: Friday, July 15, 2016 8:55 AM To: Pantera Mail List Subject: [DeTomaso] Relay Activated Battery Cut-off switch ...Could it damage anything if the battery were accidentally isolated while the car is running (i.e. MSD ignition or fuel injection computer)?