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It helps to have a wiring diagram of your car's circuits, and in the case of this Mustang, it already had been rewired with a Painless brand Mustang harness, so we had the wiring manual right at hand. Make sure you know what circuits you need to connect to and then disconnect the battery to prevent any short circuits. Painless recommends connecting the module's battery feed directly to the battery, and here we're passing the module's power and ground wires through a pre-existing firewall grommet. View Related Article
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