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]

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.