Battery cutoff question

cjmatt

cjmatt

Club Member
A couple days ago I fired up the mustang for the first time all winter just to let the fluids get movin. well I went to shut it off and just pushed in my cutoff rather than walkin back to the front of the car. and it kept running. it died out after about 10 seconds because of no fuel pressure, but I assumed it would just shut off completely. Is there a special way to wire in the cutoff so that it takes the alternator out of the loop too so it wont keep running? Anything wrong with the way its set up now? Right now the ground just gets interrupted by the cutoff switch.
 
You should put the switch on the positive side of both the battery and the alternator charge line. It should not be on the ground side of the system at all. The alternator grounds to the engine block, so it can complete a ground circuit to any accessory on the car that is grounded to the chassis, thus there is no real way to cutoff the ground to the alternator if you have the cutoff switch on the ground side of the electrical system.
 
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