Finding the accessory wire

An accessory wire will show +12V when the key is in the accessory and run positions. It will not show +12V during the cranking cycle. There will often be more than one accessory wire in the ignition harness. The correct accessory wire will power the vehicle's climate control system. Some vehicles may have separate wires for the blower motor and the air conditioning compressor. In such cases, it will be necessary to add a relay to power the second accessory wire.

finding the tachometer wire

To test for a tachometer wire, a multimeter capable of testing AC voltage must be used. The tachometer wire will show between 1V and 6V AC. In multi-coil ignition systems, the system can learn individual coil wires. Individual coil wires in a multi-coil ignition system will register lower amounts of AC voltage. Also, if necessary, the system can use a fuel injector control wire for engine speed sensing. Common locations for a tachometer wire are the ignition coil itself, the back of the gauges, engine computers, and automatic transmission computers.

IMPORTANT! Do not test tachometer wires using a test light or logic probe (computer safe test light)! This will damage the vehicle.

How to find a tachometer wire with your multimeter:

1.Set to ACV or AC voltage (12V or 20V is fine).

2.Attach the (-) probe of the meter to chassis ground.

3.Start and run the vehicle.

4.Probe the wire you suspect of being the tachometer wire with the red probe of the meter.

5.If this is the correct wire the meter will read between 1V and 6V.

finding the wait-to-start bulb wire for diesels

In diesel vehicles it is necessary to interface with the wire that turns on the WAIT TO START light in the dash- board. This wire illuminates the bulb until the vehicle’s glow plugs are properly heated. When the light goes out the vehicle can be started. This wire is always available at the connector leading to the bulb in the dashboard. It can also be found at the Engine Control Module (ECM) in many vehicles.

To test and determine the polarity of this wire:

1.Set your multimeter to DCV or DC voltage (12 or 20V is fine).

2.Attach the (+) probe of the meter to (+)12V.

3.Probe the wire that you suspect leads to the bulb with the (-) probe of the meter.

4.Turn the ignition switch to the ON position.

5.If the meter indicates 12 volts until the light goes out you have isolated the correct wire and the wire's polar- ity is negative (ground while the bulb is on).

6.If the meter reads zero volts until the light goes out and then reads 12 volts, you have isolated the correct wire and the wire's polarity is positive.