
12
Positive Shutdown, Brake Safety Switch Wire (18 AWG) (BROWN/RED)
Locate the vehicle’s brake light wire at the brake pedal mounted switch.
Verification: This wire registers positive voltage when the brake pedal is pressed.
Connect the BROWN/RED wire to the vehicle’s brake light wire.
Vehicle Tach Signal (18 AWG) (PURPLE/WHITE)
Locate the vehicle’s ignition coil or fuel injector in the engine compartment.
Verification: Refer to Vehicle Wire Color and Location Chart for the wire color and location, or test using the
following procedure:
1. Set voltmeter to AC VOLTS.
2. Attach positive lead of a volt meter to a constant 12-volt source.
3. Attach negative lead of a volt meter to the wire to be tested.
4. Start the engine.
5. Have someone press on the gas pedal slightly as you monitor the meter. If connected to the correct wire,
the voltage reading will increase as the engine’s RPM increases.
Connect the PURPLE/WHITE wire to the negative side of the vehicle ignition coil or fuel injector.
4. 8 PIN INPUT HARNESS, CONTINUED
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