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Auxiliary harness (H3)
H3/1 BLACK/WHITE (-) NEUTRAL SAFETY SWITCH INPUT
In most applications the neutral safety wire should be attached to a chassis ground. This does not apply to
vehicles that crank the starter while the transmission is in gear. If your vehicle cranks the engine while the
transmission is in gear you MUST call technical support at: 1-800-477-1382.
H3/2 VIOLET/WHITE TACHOMETER INPUT WIRE
Tachometer wire connections
Caution! In the following procedure DO NOT use a test light. Use of this
type of tester can cause grounding of sensitive electrical components, re-
sulting in damage, including damage to the power train control module.
A digital multi-meter is required to test for this wire.
Do not wear loose clothing that could get entangled in rotating engine
components. Ensure that your hands and arms are well clear of these
rotating components when working in the engine compartment. Lastly,
ensure that all wires and tools are clear of falling into or entanglement
with these rotating components.
Identify the suspected tach wire according to the web information. Next, place the black lead of a MULTI-
METER on the negative battery post and secure it. Put the multi-meter in the AC position and connect the probe
to the suspect wire with the red lead of the multi-meter. Then start the vehicle with the key. With the engine
at idle the multi-meter should read from .50 volts to 6 volts, and should fluctuate when you rev the engine.
Have a second person press the gas pedal to increase the RPMs and watch the meter display. When the RPMs
increase the voltage should rise slightly (not all tachometer outputs will rise when engine RPM increases).
Once the correct tachometer wire has been identified, turn the vehicle off.
Run the VIOLET/WHITE wire from the 5-pin harness through the firewall into the engine compartment along-
side the hood pin wire. Use the same procedure as with the hood pin wire and pull the wire through the grom-
met, taking extra care to keep it away from any moving parts or anything that will generate extreme heat.
Once the wire is run into the engine compartment, strip a small portion of insulation off the tachometer wire
in the vehicle and solder the green tachometer input wire to it, then wrap the connection with electrical tape.
Important: If using a tach signal, the tach signal must be learned before
using the remote start. (See Tach learning section)
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