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johnneilson · 05-06-2023, 09:55 AM

It really doesn't matter which side of the battery you disconnect, you just need to interrupt the circuit. I see, the mention of race car specifications listed, it depends on the sanctioning body what you are trying to accomplish, trust me, a mechanically injected and magneto ignited motor does not care if the battery is connected or not.

The SCTA requires a battery disconnect to only remove the battery circuit in case of a serious situation where the chassis might need be nipped.

Years ago, in the industrial automation field, some researcher found that digital inputs could react faster if the neg side was switched, in reality it makes no difference.

Years ago my friend pulled a customers Mod "A" into his shop and locked it up for the night. Some time later that night, the wiring caught fire and the place burned down pretty far. If there had been a disconnect switch, this would not have happened, and it would not have mattered which side of the battery was disconnected.

If someone wanted to do an experiment, you could measure the amount of amperage flowing thru each side of the battery. Then potentially use a smaller disconnect switch.

Best, John

05-06-2023, 09:55 AM	#28
johnneilson Senior Member Join Date: Jun 2010 Location: 34.22 N 118.36 W Posts: 1,181	Re: Battery Disconnect Switch It really doesn't matter which side of the battery you disconnect, you just need to interrupt the circuit. I see, the mention of race car specifications listed, it depends on the sanctioning body what you are trying to accomplish, trust me, a mechanically injected and magneto ignited motor does not care if the battery is connected or not. The SCTA requires a battery disconnect to only remove the battery circuit in case of a serious situation where the chassis might need be nipped. Years ago, in the industrial automation field, some researcher found that digital inputs could react faster if the neg side was switched, in reality it makes no difference. Years ago my friend pulled a customers Mod "A" into his shop and locked it up for the night. Some time later that night, the wiring caught fire and the place burned down pretty far. If there had been a disconnect switch, this would not have happened, and it would not have mattered which side of the battery was disconnected. If someone wanted to do an experiment, you could measure the amount of amperage flowing thru each side of the battery. Then potentially use a smaller disconnect switch. Best, John __________________ As Carroll Smith wrote; All Failures are Human in Origin.