Finding The Accessory Wire; Finding The Parking Light Wire - Directed Electronics 560T Installation Manual

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finding the accessory wire

An accessory wire will show (+)12V when the key is in the acces-

sory 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 sepa-

rate 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.

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There are several different types of parking light circuits. The

following description is for a standard negative-triggered parking

light circuit, usually located at the light switch. If the web vehicle

information suggests a different type of parking light circuit,

please contact Directed Technical Support.

Using the web information on the vehicle, locate the suspected

wire and place the red lead of the meter to a constant (+)12 volt

source and secure it. Place the multi-meter in the DC position.

Probe the suspected wire. With the switch in the off position the

meter will read off. While watching the meter, turn the switch to

the parking light position. The meter should read 12V. While

testing the suspected wire, run the dash dimmer light control up

and down — the voltage should NOT vary. If the voltage does

vary, continue probing to find the correct wire.

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