turn signals n brake lights

Probably a wiring problem. Should not be in switch, or the rest of them would not work. You might want to start with your fuses, then when you find them all OK, which I think you will, the fun begins.

Start at the tail lights and work your way forward, tracing the wiring. You will likely find wire that is either disconnected at a terminal, or cut/broken.

Good luck. I absolutely HATE wiring problems.

 

The wires back at the tail lights might be corroded. I usually have to fix mine once each winter here in Colorado. Just did it 2 weekends ago in fact.

 

Because the turn signals and brake light functions are traditionally integrated into a single circuit (bulb or light) at the rear of a tractor, the problem could most definitely be the turn signal switch! To diagnose, check to see if you have brake lights at the rear of the tractor upon brake application (with the ignition switch on of course). If the brake lights are working on the tractor itself, and you have turn signals everywhere else but..., it's almost guaranteed 100% that your symptoms will be caused by a column switch malfunction and not a wiring issue. Should neither brake lights nor turn signals function at the rear, well the problem becomes a bit more complicated. Do you have brake lights at the rear of the tractor?

On the turn signal switch, you will have 6 basic wire terminals (of course, I'm not including other circuits such as a headlamp dimmer switch):
1. Fused flasher input
2. Fused stop lamp input from the stop lamp switch
3. Left Turn output (this goes to the Daytime Running Lamp [DRL] Module, front tractor, mid-turn, and trailer)
4. Left Turn w/stop lamp output (this goes only to the rear of tractor usually)
5. Right Turn output (this goes to the DRL Module, front tractor, mid-turn, and trailer)
6. Right Turn w/stop lamp output (this goes only to the rear of tractor usually)

With the turn signal switch in the "neutral" or off position, #'s 4 and 6 above will be connected to #2 completing the circuit for stop lamps at the rear of the tractor. Then, when you activate a turn signal, it breaks the output circuit of #4 and/or #6 from #2, and connects it to #1.

What I'm trying to say is that if you have brake lights at the rear, your wiring is fine from the switch; otherwise, you would have no brake lights there since the turn signals and brake lamps share the same wiring. Therefore, if turn signals are not working at the rear of the tractor, but are working elsewhere, the problem is isolated almost exclusively to the switch. It's all circuit logic. Let us know what you find.

 

i have a 2003 columbia no turn or brake lights on back of tractor.
have them every where else. could this be turn switch or what

I gather that the rear of the tractor is blank outside of the tail lights? & that you have front turn signals & brake lamp & turn signals on the trailer?? IF this is correct you have a wiring problem in the chassis wiring of the tractor. As on the above post the T/S switch makes & breaks the brake lamp circuit as to the direction that it is positioned, however, the trailer wiring has totally seperate circuits for the brake & tail lamps. As to the brake lights being divorced from the turn signals. I'd almost bet on a chassis wiring problem, only takes 2 wires or a faulty ground to total the turnsignals & the brake lights

 

Like Brickhauler said I would bet my money on corosion at the plug . All of the obove advice is very good but I do have to add is that you get yourself a good quality test light and start poking wires and plugs.good luck