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Dome Light - Alarm Trigger Relay

Old 02-24-2019, 07:43 PM
  #1  
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Year: 1994
Model: Cherokee
Engine: 4.0
Default Dome Light - Alarm Trigger Relay

Installed an alarm in my 1994 Jeep Cherokee. I have a question about installing the dome light to the alarm. Today, I pulled the door trigger apart and noticed two yellow wires and one black wire. The question I have is what is the best method of using the dome light trigger to the negative alarm module. Using a relay how do I determine which wire is the negative?

87 - Yellow Wire (which one of the two)
86 - Negative dome light wire to alarm module
30 - Ground
85 - 12V - Constant
87A - Not used

Any thoughts would be much appreciated. Thank you.
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Old 02-28-2019, 05:30 PM
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Bust out a wiring diagram, the pin switch when closed may just ground to the chassis.
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