underbody neon to dome light w/relay

ok, i am going to try to make this the last post so you dont get annoyed with me. The supervision wire is the yellow/black wire? Is there any certain kind of diode that is best to use and exactly how do i input it into the circuit? Do i just solder it to the wires and tape it up? Also, to clarify you said that it will only turn the neons on with the alarm and the switch. By switch do you mean the toggle that I want to add or the factory dome light switch. Thanks for all your help.

The yellow/black is the car's domelight wire. If you DON'T want the neons to come on with the domelight the DON'T use this wire. If all you want the neons to come on with is the alarm then you need to locate the alarm, find out which wire is domelight supervision wire and use this wire to activat the relay instead. Alarm must be aftermarket to use the alarm only, on with arm(if alarm does this) and disarm. Switch mentioned would be an add on aftermarket toggle switch. A standard 1 amp diode is fine since you are dealing with low current(only activating a relay).Certified Security Specialist

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