Dome light + Trigger tied?

I want to add that you must check for if the dome supervioring light is either negitive or postive output .. so you have to hook up the relay depending what output it is .. the picture above I saw whoever did the picture use postive dome light out .. so it just depend on what your alarm system instruction calls for but still if it says it's less 200mA out then you need to use a relay switch .. 

Bill

What type of alarm?

What type of Car?

Dodge generally uses a negative door trigger system. As long as your alarm combo uses a neg domelight wire you'll be fine. The domelight will only come on after disarming when the alarm will ignore a neg feed on the wire. Basically what your doing is tricking the car into thinking you left a door open. 30 seconds later the alarm tells the car you've closed it.

What you want to do is connect the relay like this, you will need one in most situations and it's better to be safe than blow up a circuit on the main alarm pad.

85=+12 volts constant

86=Domelight wire from alarm.

87=Connects to the NEGATIVE domelight wire in car

30=connects to ground

87A=not used.

Connect the neg door trigger from the alarm at any point on line 87.

This way when the domelight wire comes on from the alarm the relay turns out and connects pin 30 to 87. This applies ground to the circuit and turns on the domelight. The Door trigger wire can be connected anywhere down line of pin 87. This way if someone opens the car and the NEGATIVE wire turns on and the alarm see's negative currnet which sets off the alarm.

So to answer your question, YES, the door trigger and domelight in this vehicle should be connected. Be sure to meter your wire to verify the wires are negative. If they're positive triggered email me an dI'll tell you how to fix.

Good Luck 

Your going to blow another one if you don't use a relay switch for your dome supervisor light trigger ..

Bill