adding a siren to factory alarm?

You lost either ground or switched power to the relay.

its all still hooked up the way it was from the start. maybe its the relay(bad)?

You need to use a volt meter to verify that you have switched power on 86 and ground on 85. There is no way to find this out without a meter.

Put in new relay still stays on constant. only other thing i did was put in an optima battery instead of original. mounted the factory pos and neg wires to side posts. the hid kit and the constant wire(pin 30 on relay for scanner) to top mount pos post. could any of that be a culprit?

sorry i think i may have posted that last post twice.

would an ignition wire be the same as a switched power wire or no? and to answer your question from earlier, no i dont have a cig lighter in truck. just a power adapter for a cell phone charger or whatever. it only has 2 wires on the back of the plug. i believe the one is switched since it will only work(power on) with ignition run/acc. i unhooked the 86 pin(i have on ignition wire at steering column) and the scanner will stay on with or without that connection(key on or off too)  so im guessing thats the problem area.

Switched power is a power source that is controlled by the ignition switch. Be it, an Ignition, or an Accessory source. If the relay is missing power on 86 or ground on 85, the scanner will be on all the time. When switched power and ground is applied to the relay, the connection between 30 and 87 will open, this causing the light to go out. If this is not happening, you are missing one or the other. You will need a volt meter to test this.

ok, got the scanner working right again. i just tapped into that power adaptor i mentioned before and all works great. now i need to get back to the magnetic /reed switch on the door as i got a magnetic switch today. it has 2 wires on the one piece. i wondering what is the correct way to wire the switch into a relay like you mentioned so that the scanner will come on only when the doors are locked but not while driving after i hit 15 mph and they auto lock?

Anyone?