Battery Shut Off Switch
You don't need a 4 post switch.
If going NHRA legal it must be on the positive cable. There are many ways to do it, some are legal but not the safest. If you want minimum the main cable runs through the cut off and heads to starter. Alternator wire runs to back of car and attaches on battery side of switch. The OEM black wire must be disconnected at alternator. Run a jumper from starter lug to starter relay 5/16 stud. I do not like this method, but it is legal and gets by. Not a fan of the always hot alternator line.
This is legal, ackkkk
You don't need a 4 post switch.
If going NHRA legal it must be on the positive cable. There are many ways to do it, some are legal but not the safest. If you want minimum the main cable runs through the cut off and heads to starter. Alternator wire runs to back of car and attaches on battery side of switch. The OEM black wire must be disconnected at alternator. Run a jumper from starter lug to starter relay 5/16 stud. I do not like this method, but it is legal and gets by. Not a fan of the always hot alternator line.
This is legal, ackkkk
