11-10-2009, 03:49 PM
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CC Member
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Join Date: Jan 2002
Location: Northridge,
CA
Cobra Make, Engine: Arntz Cobra
Posts: 1,839
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Not Ranked
The BIG problem is the BIG wire that has to carry all the current from the alternator to all the circuits of the car and to the battery to charge it. You cannot cut that off without a massive (and totally impractical) relay.
You have to focus on cutting power to the ignition system and fuel pumps (if they are electric). It does not matter if you do that on the hot side or the ground side. It is important that both the emergency cutoff switch and the inertia switch break the connection to both of these circuits. Once you cut ignition, the engine will stop and the alternator will make no more power. Then, there is very little danger of a spark igniting all that spilt fuel.
If you don't have an inertia switch, you can get one out of a junkyard Mustang for almost nothing. Odds are, it has only been used once!
RallySnake
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Last edited by RallySnake; 11-10-2009 at 04:29 PM..
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