I just bought a truck and as i was going to lock the doors when i shut off the engine it didnt lock. i was checking it out and it only works with the ignition to the on position. also the interior lights do not turn on with out the ignition to the on position. I am wondering what could be the problem.

 

??? If you're trying to lock it with the key in the ignition, it probably won't let you. Could be a bad ignition switch.

 

no lets say im going to go into the truck (i unlock it but the dome light doesnt turn on nor does the unlock/loc switch work. as soon as put in the key to the on position the dome light turns on and the unlock/lock switch works.

 

Sounds like it could possibly be the ignition switch. What year truck is it?

 

its a 2003 4.7 1500

 

I would look into that ignition switch.

 

thank you very much for helping me but i already found the problem, i was a fuse but it was was hidden