Battery Disconnect / Isolator

[gdmn852]

Hello, I always have the disconnect switch on whatever is the ground side. On cars with electric clocks, I wire a 5 amp to the ground to keep the clock alive, clock itself is only a 3 amp and if anything should short out 5 amp should, hopefully blow.(1949 Buick )

[The Master Cylinder]

Originally Posted by Phil Brown

Most of mine are on the suply side because they need to meet the rule book for NHRA drag racing and there very clear on the master switch wiring. I know that were not racing here but 50 years of use with no ill efects I think putting the switch on supply side is fine, everything else in your car is switched on the supply side with no problems

If I remember correctly, I think for drag racing they require a different type of switch that also kills the ignition.