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Author Topic: battery kill switch question  (Read 3805 times)
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Location: AZ
Posts: 19

« Reply #15 on: September 12, 2017, 04:15:08 PM »

If concerned about a fault rubbing the circuit and keeping everything on, it is just as easy to trigger the
relays high-side instead as low-side.  You just run the fused loop thru the switches and permanently ground
the opposite terminal.

Alternators that will keep the engine running are not limited to the single wire variety.  Two wire Bosch, Delco
and Nippondenso  (Denso) units that I've worked with won't.  Only some of the newer style systems with
separate switched power and sense wires can recognize the battery disconnect and shut down.  So don't
assume, test.  And test at a decent RPM. I've seen cars pass the battery cutoff test at idle due to low alternator
output (underdrive) but continue to run when RPMs are elevated.

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