If the indicator light is not glowing, I would check the main power source at the controller to see if you have 12 volts available. The controller will not effect the running and turn indicator light functions of your trailer; they are hard wired from your truck.

Most trucks have  more than one fuse boxes, and it may be that one was missed during your inspection. By checking power at the controller, you can accurately determine if it has the necessary voltage or not. If it does not have power at the plug under the dash to your Tekonsha, then there is probably a blown fuse that has been overlooked. It could also be that the plug has become unseated, or that if wiring splices were installed, the feed source has become disconnected.

If it is indeed a blown fuse, finding a reason why it blew may be problematic.

Gard

The fuse box under the hood, above the driver's knees, has the fuses for the trailer running lights. I'm not sure where the power source is for the factory installed brake controller wiring. That's why it's easier and faster to check at the plug with a multi meter.

BOL  Gard

I agree on the adapter situation. This was where we had a wire work loose earlier this summer. Hubby fixed the issue so I canceled the appt. for adding a new wire/plug from front to back. I believe I will go ahead and remake that appt as I am very tired of issues with the setup.  I have had trailers in the past that required a 6 way..and trailers that require a 7 way. So the adapter was helpful. I have also had issues with different brands of trailers having turn signals opposite. It would be nice if all was universal in regards to plugs ect. Maybe the new models are?? Example: if I hook up a family members 01 Titan to my truck/plug, blinkers are backwards vs what the are on my 05 Featherlite. I have had the same issue with an 03 Kiefer and an 01 Sundowner. Not knocking any trailer.. just seems some of the wiring setups are different which requires switching out wires within the truck plug (hope all of that made sense).

genebob.. I am with you on "huh???" 

UPDATE... hubby worked on wiring yesterday. There was power from the truck to the brake controller. Not sure why the controller wasn't working as all of the lights ect were working via the truck plug/adapter/ ect ect. He rewired the female plug- in at the back of the truck to just the 7 way..so no more adapters. Wholla..the controller glowed green and brakes hummed at the wheels. UNLESS I jiggled the trailer plug that was plugged into the 7 way. I suspect the 7 way female end is not holding the trailer plug as tight as it should be. (there are no loose wires connected to the female, it is very tight ect. If the plug is just sitting there.. everything works. Wiggle it a bit..and lights blink. Just my observation on that.. will buy a new one to see if that helps. I live a 1 1/2 miles off of the highway and our road is not smooth by any means. Could be if the female plug is not holding the trailer plug tight.. I am going to continue to have issues??

IN re-checking all of the lights ect after doing away with the adapter...   one marker light will not cooperate. There is power to the unit. We can pop the light off of the unit and plug it into another marker light unit and it works. If we plug it back into it's original slot it won't work. But..there is power there.   Any ideas on that one? We cleaned up everything we could to make sure there was a good seat....still no luck. ( I hope all of that made sense)

Sounds like you have everything under control. Buy a replacement light ( sounds like the socket is bad) and replace it. It's a five minute job and saves a lot of headache later. Many light assemblies styles are available in led configurations. They are more water proof and seem to hold up quite well. We use them on trailers that are completely submerged in water when launching boats, with fewer problems and more reliability than the old bulb and socket assemblies.

Gard