Originally Posted by tw0Bears
Have a 2005 Winnebago Vectra. Rear running lights come on but no turn signals or brake lights. Front turn signals all work. Have checked all fuses and light bulbs. All are ok. Could turn signal controller be bad?
Your coach and its wiring, should, (I say "should") be pretty darn close to our '04 Itasca Horizon 36GD with the 330HP CAT. Ours is on a Freightliner chassis and, if I'm not mistaken, yours should be too. Now, if, yours has the same wiring installs and, locations, then I'm pretty sure your relays and fuses etc. for the turn signals could, or should be, in the left front compartment, just in front of your left front tire. It all depends on if they setup yours the same way as ours.
I just went out and looked at mine and, opening the compartment door reveals all the resettable circuit breakers and, a fuse box that contains fuses and relays. One of which is labeled, ""Turn signal Power". Now, just what that means and, what it applies to, I'm not sure of. So, maybe it's a start for you to diagnose your issue.
Now, the fuses and relays for the trailer plug, are located in a completely different location. On mine, they're behind the louvered panel, that is over the dash A/C condenser at the left rear of the coach. Not sure if yours are there or not. But, normally, those fuses and relays don't have anything to do with your coach lights, only the wires going to the trailer plug on the coach. Hope some of this helps. Good luck and, please report back on what you find is the problem so that others may learn.