Ok here's one for ya: clearance lamps turned themselves on when the switch is off

'03 T600 in my signature...

I look out in the driveway and my clearance lights are on... WTF?

Go check the switch in the cab. It's off. Turn the switch on, the clearance lights turn off.

Turn the switch off, the lights turn back on. Just the lamps on the top of the cab and the top of the sleeper.

I have 4 switches for my headlamps, fog lamps, clearance lamps and parking lamps.

Uh.... any ideas (other than flip the switch to the "ON" position and walk away like I've already done)? LOL.

I'd have thought if the relay went bad they would just stay on or stay off, not reverse their operation.

 

Guess I've got some digging around to do. Been home for a few days and the lights have been off until this afternoon. Hasn't rained in a day or so, and the truck has been sitting in one spot so who knows LOL.

I appreciate it, thanks! I really like it too. Been a really good truck. Need to replace that mirror cover though, lost a battle with an owl a month or so ago. Then again I don't think the owl exactly "won" either.

 

It gets weirder LOL. Swapped relays thinking for sure the relay had something wrong. Nope, same thing. Pulled the switch panel off, disconnected the harness for both the clearance lamps and headlamps and hooked the clearance lamp harness up to the headlamp switch. Same thing. Stumped for the time being, what am I missing? My original plan to just roll the switch over so it was upside down (lol) was foiled because of the notch they put in there so it can't roll around on it's own.

 

Back to normal today apparently. Looked out at the truck this afternoon and the lights were back on. Flipped the switch to off and the lights go off. What a weird one. I was reading somewhere that Kenworth uses the switches on the dashboard to complete the circuit to ground rather than applying 12v to the circuit. My guess is that some moisture in/around the lights could lead to the circuit grounding out and the lights coming on. But I would think they would be stuck on then and I wouldn't be able to turn them off. Who friggin knows.