Install Tips
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Tip Number: 108
3-Wire Positive Door Lock Systems
Applies to: All Vehicles Before connecting any wires, you must first determint the type of master door lock switch the vehicle has. There are 3 basic types of door lock systems: 3-wire negative, 3-wire positive, and 5-wire reverse polirity systems. Each system can be identified by testing thewires coming from the door lock switch and determining the polcarrity of the wires with a multimeter or voltmeter.
There are 3 wires coming from the switch in a 3-wire positive door lock system. The switch has no power at rest and receives +12 volt power when in use. Refer to the item instructions for complete wiring
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