Here is a fuzzy pic of the inside of the dome light assembly. It comes out with just some pulling on the assembly. The white wire that leads from the switch to the light bulb on the left is the one you want to splice into. The yellow wire is the positive lead that is always on. The gray one is the wire that goes hot when you press the map light switch. So jump in front of the bulb and no matter what source you use to turn the lights on (aka map button, or the dimmer switch on the dash, or hitting the remote fob) it will turn your other accessories on too. It has a 15a fuse up to the dome light area, so I fused the next link with a 10a fuse just to be safe.