Cut the positive battery cable near where the switch will be located. If wires come loose you could get arcing and overheating which could lead to a fire however thanks to reliable connectors and terminals its fairly easy to make safe strong connections.

120v Ac Wiring Roadtreker
Cut off switch wiring. Installing your own cutoff switch is relatively easy but please heed the cautions outlined below. Then cut another cable of the same rating with about 16 20 extra inches and prepare it at both ends in the same manner. Connect one ring terminal to one main stud terminal on the switch and connect the other ring. Disconnects receive 240 volts and lethal current from feeder lines coming from the utility meter. Install 38 ring terminals on each cut end. Buy a new switch.
Theres considerable controversy over whether its best to hook up the master shutoff kill switch to the batterys positive or negative side. This is in effect creating a shunt a deliberate short circuit across coil b so that it can no longer produce any sound. Figure 1 shows the simplest wiring for a coil cut switch. Wiring the 4430 kill switch turn the car off and disconnect the negative battery cable. But there are a few things you have to. The disconnect switch does not shut off the power in the feeders lines or at the switch connections.
Making tight electrical connections is critical to a safe wiring job. The feeders and the terminals they connect to on the disconnect switch are live at all times unless the utility has shut off the power to your service. The easiest type of switch you can. When the switch is on it grounds out the middle wires which causes both of coil bs wires green and white to be connected to each other. Remove about 75 inches 19 mm of their insulation before inserting the cable into the cable connector and clamping it in place in the disconnect box. A cutoff switch is installed on or near the battery and is used primarily to prevent battery charge depletion and.