Did you have a shop install this? if so then take it back have them connect everything the right way!

I don't have the full blown alarm, but the just the Powercode remote starter (RMST). alot of us have been talking about the RMST. First, here a few files that will help including installation instructions:

http://home.comcast.net/~donpaul/F150_legend.jpg
http://home.comcast.net/~donpaul/F150_wiring.pdf
http://home.comcast.net/~donpaul/Ford_alarm.pdf

I had a shop install mine, but I had to fix a few things on my own. If your interior light does not come on, then they didn't hook up the dome light wire. Be sure that wires A-3 and A-20 are connected to the black/blue dome light wire. My shop didn't do that. I called them and they claim they charge extra for hooking up the dome light. What a bunch of BS, it's just 2 wires to hookup, they are already under the dash hooking up all the other wires, what's 2 more wires!!!

Yes, the lights stay on alot longer now after you close your doors and lock the truck. Usually 30 seconds and the lights will go out.

I didn't hook up the headlights, so I can't help you there. Look at the file above I posted.

Your original factory RKE keyfobs should still work, did you try them?

I don't think it will go into Valet mode or Programming mode unless all the wires are connected. Mine wouldn't go into programming mode until I hooked up those two wires to the dome light wire. My program button is in my driver's side kick panel. Look around they should have installed it somewhere.

You may even want to look under your dash and find the main brain unit for the system. And then trace all the wires coming out of it, and refer to the files above I listed.

good luck,
Steve