Dome light + Trigger tied?

can the (-) dome light and (-) trigger from the alarm be tied to the dome light of the car without trouble? This is the only thing that I THINK could cause a problem because the alarm would make a ground connection to turn the dome on and the alarm see the ground and sets the alarm off right? I'm not sure I think I'm just looking into this too much.

Think about it like this......when is the ONLY time your gonna turn on the dome light............................................................................................................................when you disarm and unlock the doors.

If that is what your car calls for then yes. This is very car dependant.Certified Security Specialist

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Well this is the whole problem. I got an alarm setup because I am ok with with anolog and digital electronics (I went to a trade school) and with auto (learned from my father) so I gave it a shot. I hooked it all up with a combo setup locks remote start and alarm, and it all worked...but, when I went adjust the shock sensor by setting the alarm off by hitting the truck I let the alarm run its cycle a few times and it died slowly until the horn took over and thats all that sounded. Now I went over everything again and again and the only thing that I think could cause conflict is that the alarms dome and trigger are tied togeather. And because one creates and the other recives thats this only possible thing I can think of besides defect. I think when the alarm sets off the dome flashes as well. BTW the truck is a Ram 1500 01. Thanks for the input so far.

I guess my question is Do I need to use diodies for that? None of the install notes mention to use a diode, just doom is same as door trigger.

Well..some cars have the dome light circuits tied into the door lock circuits.. I.e. when the door locks unlock, the dome light comes on automatically. I can tell you that on mazda protege's, they are wired this way. I don't even bother hooking up the dome light supervision wire in those cars..works everytime. As for the dome light and door trigger interfering, I cannot see how. The door trigger is an input line.. the dome supervision is an output line..I'm talking alarm wires..not car wires. I can understand where you think a dome light wire comes on to feed the door trigger wire and trigger the alarm. The only time a dome light comes on besides the factory design is when you unlock a car (it sends a signal to the dome light wire to turn on) or the alarm goes off, it flashes the dome light to attract attention.. When you hit disarm on the alarm keyfob, the priority is always to disarm the sensors, unlock the doors (if programmed) and turn on the lights (if programmed) The design of aftermarket alarms always computes a couple of milliseconds to send a pulse on the dome light wire.. Use a meter to verify what I'm talking about..or even watch the dome light activate delayed a bit after disarm. I have never seen a dome light interfere with a door trigger. You can diode isolate, or better, relay activate the dome light wire..Gives you a bit more delay with the relay in circuit.. Put a 1amp diode with the silver band facing the car side on the door trigger wire..basically the silver band is facing away from the alarm brain. Wire up a relay with pole 85 to the alarm dome trigger wire, pole 86 to fused 12v, pole 30 to body ground, and pole 87 to the car dome trigger wire. Btw, check your grounding points for your alarm.. a weak siren usually means a poor or no ground..

My main concern was that on the alarm I had both the trigger and dome light wires tied togeather and the trigger from the alarm would input from the dome from the alarm and cause the troubles I had with with the unit. The more I think about it seems less likly that and just a defect. The siren was not weak it made that dieing sound thats hard to replicate by writing, kind of like a cop car in a movie when it gets totaled :lol: if that can give an ideal of what I'm talking about. All my grounds are 100% and I did check again but what made me think it was fried was that the horn sounded only the unit did not respond to remote and the led went dead.

I will check the current its drawing but I don't think its much and even the wire is very small. I do not have a keyless module and it is - for the dome. But is it ok to have the trigger tied with the dome on the alarm then goto the dome wire on the truck if its low current? Or do I have to use diodes or relays with diodes? I'm starting to think its too much trouble for a stupid dome light and just lose it and only keep it for the trigger. And I thought the dodge 5-wire locks was going to be the big problem. :lol: