![]() Test your installation by turning the switch on and starting the car. Connect the other end of the resistor to a chassis ground. Connect one end of the supplied resistor to the last remaining "W" terminal.If you connect the ring terminal to the stud which does lead to the battery, you will just short the battery to ground, draining the battery and creating a potential fire hazard. Connect the ring terminal to the 3/8" main stud terminal which does not lead to the battery.Connect the female spade terminal to one of the "W" terminals (polarity is not important).Now make a simple jumper wire with a 3/8" ring terminal on one end and a 1/4" female spade terminal on the other. ![]() Connect one spade terminal on one of the "Z" contacts and the other spade terminal on the other "Z" contact.Cut this wire and install a 1/4" female spade terminal on each cut end. Locate the main power wire from the ignition switch to the ignition system.Connect one ring terminal to one main stud terminal on the switch and connect the other ring terminal to the other stud.Install 3/8" ring terminals on each cut end. Cut the positive battery cable near where the switch will be located.Turn the car off and disconnect the negative battery cable.The 4430 switch has a third set of contacts (labeled "Z"), which interrupts the ignition circuit when the switch is turned off. 4430 Master Battery Switch with Alternator Protection has an auxiliary set of contacts (labeled "W") which are open when the switch is on, but which make contact when the switch is turned off.Ī spinning alternator can still put out electricity, so just disconnecting the battery will not stop a running engine. This spike can be avoided by giving the alternator output a safe path to ground just when the switch is turned off. If you disconnect the battery on an alternator-equipped car while the engine is running, the alternator could be damaged by a voltage spike. Why Use a Battery Cut-Off Switch with Alternator Protection?
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