Good timing on the topic. I am currently installing a dropped battery box and the subsequent battery cable rerouting. I have always envisioned installing a discreet battery disconnect switch for security and safer storage. The idea of a "kill switch" that could be used to shut down a running engine seems like a good idea. I had never thought about the difference until this topic. After a brief course at the University of Google this morning I have found a couple of kill switches that would appear to have the necessary six post setup. https://www.pegasusautoracing.com/document.asp?DocID=TECH00109 http://www.flamingriver.com/index.php/products/c0015/s0001/FR1013# As always your thoughts and opinions are welcome! John -----Original Message----- From: DeTomaso [mailto:detomaso-bounces@server.detomasolist.com] On Behalf Of Larry - Ohio Time Sent: Saturday, July 16, 2016 8:37 AM To: 'Joseph F. Byrd, Jr.' <byrdjf@embarqmail.com>; 'Pantera Mail List' <detomaso@server.detomasolist.com> Subject: Re: [DeTomaso] Relay Activated Battery Cut-off switch Race car kill switches generally have two circuits. A heavy duty one for the battery and a lighter duty one for the ignition. You want everything off should there be a problem. Most of what you see on the street is to isolate the battery when the car is parked. Larry - Cleveland -----Original Message----- From: Joseph F. Byrd, Jr. [mailto:byrdjf@embarqmail.com] Sent: Saturday, July 16, 2016 10:39 AM To: 'Larry - Ohio Time'; 'Pantera Mail List' Subject: RE: [DeTomaso] Relay Activated Battery Cut-off switch I agree, it is not something I would intentionally do. Given I have "at the battery" knife switches, It is sort of intuitive to cut the car off, open the hood and disconnect battery. However, many decades ago, I did install a turn switch in the console of the TR6. I was initially surprised when I give it a turn and the car continued to run (including all lights etc). When Ron asked, I thought how are those electrical kill switches wired in race cars? Do they kill the ignition or do you assume the engine died in the wreck and just isolate battery? Thus there could be two sort of different objectives with the battery switch. If you used a single contact to kill the battery and alternator, the alternator diodes could drain a battery in storage. Joe -----Original Message----- From: Larry - Ohio Time [mailto:Larry@ohiotimecorp.com] Sent: Saturday, July 16, 2016 10:12 AM To: 'Joseph F. Byrd, Jr.'; 'Pantera Mail List' Subject: RE: [DeTomaso] Relay Activated Battery Cut-off switch Hi Joe, The disconnect switch on the (+) or (-) cable does the same thing, it isolates the battery from the car. I am a bit confused by you wanting to disconnect the battery but yet still keep the car running. What is the reason you want to do something like this? With all the electronics in cars, even ours, this is not something you want to do! Larry - Cleveland -----Original Message----- From: DeTomaso [mailto:detomaso-bounces@server.detomasolist.com] On Behalf Of Joseph F. Byrd, Jr. Sent: Friday, July 15, 2016 4:50 PM To: 'Pantera Mail List' Subject: Re: [DeTomaso] Relay Activated Battery Cut-off switch 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)? _______________________________________________ Detomaso Email List is not managed by POCA Posted emails must not exceed 1.5 Megabytes DeTomaso mailing list DeTomaso@server.detomasolist.com http://server.detomasolist.com/mailman/listinfo/detomaso To manage your subscription (change email address, unsubscribe, etc.) use the links above. Members who post to this list grant license to the list to forward any message posted here to all past, current, or future members of the list. They also grant the list owner permission to maintain an archive or approve the archiving of list messages. _______________________________________________ Detomaso Email List is not managed by POCA Posted emails must not exceed 1.5 Megabytes DeTomaso mailing list DeTomaso@server.detomasolist.com http://server.detomasolist.com/mailman/listinfo/detomaso To manage your subscription (change email address, unsubscribe, etc.) use the links above. Members who post to this list grant license to the list to forward any message posted here to all past, current, or future members of the list. They also grant the list owner permission to maintain an archive or approve the archiving of list messages.