Dome light/Radio

[bowhunter88]

The other day, I go to start my truck, and notice that the light didnt come on. After I started it, the radio was totally dead, it had absolutly no power. Thinking that it must be a fuse or somthing, i pull out the fuse which was blown, and stick a new one in. Immediatly, it sparks and blows. So a week later, i figure i am going to get to the bottom of it. I get out my multimeter, and some extra fuses. Multi-meter indicates that everything is fine, so I put a 20amp back in, and the light and radio come on. ??????hmmmmmmm So later that day when i am driving around the dome light randomly comes on, and i cant get it to go off. 10 minutes later, it goes off on its own. THe following morning I come out to start the truck, and the dome light is on. Luckily the battery wasnt dead.

It must be a loose wire or somthing, but where, and HOW do i get to it?
Note: The dome light that comes on, is the one that comes on when you open the door, not the one that you can click on/off.
Im thinking maybe my door switch could be bad.

Im looking for things to try any help would be GREATLY appriciated!

Steve

[BHB]

Your dome light and radio memory circuit are tied together. aftermarket radio? I would look there first. Check for chafed/bare wires (power)that could be touching to ground, if you insert a fuse,and it blows immediatley, that is a dead short to ground.
As for your dome light, they are negative trigger, meaning that when ground is supplied through the door pin, they turn on.
Check your door pins on the dash first they crack and break, and go back from there.