[DeTomaso] Relay Activated Battery Cut-off switch

[Thomas Törnblom]

There are battery cut-off switches with separate low current switches that can kill ignition too, which would stop the car. I guess it could be wired to kill the field winding in the alternator, which would stop it from generating any current. 

> 16 juli 2016 kl. 16:39 skrev Joseph F. Byrd, Jr. <byrdjf at embarqmail.com>:
> 
> 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 at 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 at 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 at 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)?
> 
> 
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