Problems with my turn signals staying on

Two wires touching somewhere in the trailer most likely. Unplug your trailer plug and recheck.

 

Take out the relay fuse out and put it back after few sec... It should be back to normal...

 

Remove the bulbs. Use hand signals instead. Problem solved.

Seriously though look for some shorted wires.

 

Start with what's simplest. You have some kind of a short somewhere, that's affecting your right side lights.

Disconnect your trailer plug from the tractor and try it. A bad plug can do that.

You must have some spare bulbs. Change them all, including the headlight. It sounds insane, but I had a motorcycle one time that wouldn't run because of a short. It ended up being the taillight bulb itself... I wouldnt believe it if I didn't experience it.

Another thing is to check all of the ground wires for your lights. Each light has to be grounded directly to the chassis. Run a separate ground if you have to. I have seen guys go just about crazy with trailer wiring, with lights coming on that are not supposed to, when it was a bad ground.

Check the wiring BEHIND the trailer plug. Wiring can short there. Also check the wiring to the headlight. Somewhere there it splits off into your markers (and turn signals). You can disconnect your lights one at a time and see if you still have the same problem.

My guess is a bad bulb or bad ground.

 

I own a 2000 Century and have had strange headlight / turn signal problems in the past. The problem was where the cable harness folded over at the hood. Each time you open the hood the wires get a little abraided and you get both shorts and opens. That's where I would begin to look. The second place would be the turn signal actuator on the steering wheel column. Mine is at the point where I need to check that it's been moved fully into the correct position.

It's possible that it's a driver age related condition....(jk)

 

I would check the tail light bulbs and next the front turn signal bulbs. The tail lights use the same bulb for tail and brake lights. The filament will sometimes break off and short across to the other fillament (tail light and signal/brake light), causing all kinds of weird light problems.

 

Your headlights run through your turn signal switch. There are little copper contacts in it and they can break and short across other contacts. That would be my guess.

You can unplug the switch and ohm it out. I think the right side is the Light Green wire and the Headlight Hot is either the Red or White wire.

The left side is the yellow wire. Your ohm check should be the same as the right side and show open.

There's like 3 different switches. If you can get the model number off it I can get the exact wiring diagram.