K I have a cheap Whistler radar detector and wanna hook it up to a switch, but how on earth do I ground the radar detector itself? Its just one that plugs into a cigarette lighter.

Why dont you just hard wire it to the fuse box. That way when you turn the car on it turns on & off when you turn the car off.

put the switch in the kick panel driver'* side. there'* a nice screw under there for grounding, it'* on the radio side of the cavity.

If you cut the end off the lighter adapter, you will see that there are really two wires there: the hot and the common (or ground). Typically these connectors are round, with an inside and outside to the plug. The outside should be the positive. You may need to check with a continuity tester which wire is which. Sometimes, one of the wires has a white stripe, that is the common.

Find a spare circuit in your fuse block that works off of the ignition (or accesory) and wire from there with a new inline fuse. Route the wires up the A-pillar and splice onto the plug for the detector. Run the common the same way, but tie it to a good ground under the dash. This assumes that you mount the detector on your visor.

Yep, what they said, one wire hot, one ground.

I had one in my old Delta 88 that I actually managed to mount the detector behind the grill, and the display in my dash. That was kinda cool.

I should have said this before hand. I have a relay that turns on automatically when the car ignition is turned on by tapping into a fuse, so I run everything through that relay. I just needed to know if there is a ground wire in the detector, Jstpsntym answered my question.