i was gonna run a on/off on the power wire to the motor only more for secuirty reasons than anything. i have it laying in the shop new in the package and got it for free so i figure i will use it for something. i have ran relay isolaters before, if hooked up properly they do work, most people i have seen run them do not know how to properly set them up. i have a stinger one that i used/going to use again in a car i have that has a big stereo and air ride suspension with 2 compressors so it needs 2-3 batteries.