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Old 07-15-2011, 02:57 PM
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Kill Swith "Keep-Alive" bypass fuse rating

Hello Folks,

I would like to install a fuse (or circuit breaker, perhaps?) to bypass my battery master disconnect, so that when I activate the switch (and disconnect the battery), there is still a slight current flow across the switch to keep the TPI, radio, clock etc. settings. Would a 5 amp fuse suffice?

I guess I want something large enough to support the electronics settings, but one small enough to blow instantly if someone tried to surreptitiously start my car, or if there is a catastrophic short somewhere in the electrical system.

Thanks in advance.

Cheers, Ken

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Old 07-15-2011, 04:38 PM
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5 amp would be overkill. A 2 amp is all you need, and supply the power with a 18 or 20 awg wire. If a thief tries to start your car the fuse will pop.

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Old 07-15-2011, 07:40 PM
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Agree 5 amp overkill, heck 1 amp would easily do it actually, those memory chips are very low current.

The only thing I would say you will want to remember is that when the battery has been interrupted, not turn on the radio and blow a low amp fuse thus taking out all the other settings.

The old working on the hotrod listening to the tunes routine, something I did when I was a kid. If that is something you do then I would at least have the ampere of the fuse that would support that.
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Old 07-15-2011, 08:17 PM
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1amp should be fine but you can install a multimeter in series with your battery wire to see how much current is going through when the car is off.

I think even 30amp would NOT get the car started. When your starter kicks in thats a good 100amp or more blast for a split second.
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Old 07-17-2011, 10:54 AM
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I wouldn't worry about the size of the fuse. If someone tried to start the car, that WIRE would become a fusable link.

By the way, you can even buy battery disconnects that already have the fused bypass now.
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