Positive ground battery disconnect switch?

[1948F-1Pickup]

Originally Posted by JayChicago

Don’t see why having the disconnect on the “hot” terminal rather than on the ground terminal will make a difference.

It only matters to sanctioning bodies like the NHRA.
They always say it should be on the positive side and should stop all electrical functions.
Their reasoning is, if the switch is on the negative side of the battery, the alternator is not being interrupted and could still generate power and cause issues, since it is still capable of generating power in the electrical system.
(Back feed of the ignition)

[51504bat]

Originally Posted by 1948F-1Pickup

It only matters to sanctioning bodies like the NHRA.
They always say it should be on the positive side and should stop all electrical functions.
Their reasoning is, if the switch is on the negative side of the battery, the alternator is not being interrupted and could still generate power and cause issues, since it is still capable of generating power in the electrical system.
(Back feed of the ignition)

I understand the NHRA position but on my daily driver my disconnect switch breaks the ground. The reason being that with the ground disconnected if something happens to touch the hot post to the frame nothing will happen. If you break the hot lead as per the NHRA and somehow there is a connection between the hot post on the battery and a ground source then sparky sparky. JMO

[paul2748]

Totally agree

Originally Posted by 51504bat

I understand the NHRA position but on my daily driver my disconnect switch breaks the ground. The reason being that with the ground disconnected if something happens to touch the hot post to the frame nothing will happen. If you break the hot lead as per the NHRA and somehow there is a connection between the hot post on the battery and a ground source then sparky sparky. JMO