Vehicles with LEDs will have problems with standard trailers unless a powered tail light harness is used, or there is a factory tow package. If your 7-Way on your Acadia is indeed a factory connector, you should have no problems with LEDs vs. incandescent lights.
Most small utility trailers do not have a 7-Way. 7-Ways are used on larger trailers that have electric brakes, or hydraulic systems powered by a battery, or boat trailers with hydraulic actuators with reverse lockouts.
If your... view full answer...
If you've just installed a 7 way connector like the # ETBC7, you'll want to start by testing the plug on the vehicle using a circuit tester like the # PTW2979 to make sure that each pin is operating properly; you can refer to the photo attached or a helpful article that I've linked for information on testing the circuits. I would also recommend making sure that your ground wire on this harness is firmly grounded to a paint and rust free spot, as ground wires are the most common cause for... view full answer...
I have not heard of this issue before on an OEM part installed on a vehicle. Usually if this happens it is on the trailer and is usually a ground problem. I am not sure how the OEM harness installs but if it has its own ground wire then make sure it is attached to a clean bare metal surface. No paint or undercoating can be present. Also, it really should be grounded to its own location and not share a common ground with other electrical devices.
It is possible that the trailer lights are... view full answer...
It sounds like you have a proportional brake controller, like the Prodigy P3 # 90195, installed on your 2020 GMC Acadia. Since a proportional brake controller uses an internal inertia sensor to help determine how much power to send back to the trailer brakes it won't send any power when you are sitting still. That's why you're able to apply the brakes with the manual override and not with the brake pedal.
The lights for your trailer are actually on separate circuits from the trailer brakes... view full answer...
It sounds like you are either missing a fuse or have blown it out. You are looking for fuse F11 in the rear compartment fuse box of your 2020 GMC Acadia. This would cause the reverse function to go out but not the other ones with the Tekonsha T-One Vehicle Wiring Harness for Factory Tow Package - 7-Way Trailer Connector item # 118276. I have linked a picture below that will help you find the fuse location. This fuse box is in your rear cargo area on the driver's side. view full answer...
You have already started the troubleshooting process to find the cause for your trailer's left-side turn and brake lights not working. Since another vehicle has no issue with this trailer this does tend to suggest that the issue is on the Acadia.
Since both 4-pole and 7-way trailer wiring setups combined the left stop and turn signals onto one wire, typically a yellow one, what I suggest is that you start a close inspection of this circuit/wire at the trailer connector itself. You can... view full answer...
The Roadmaster Nighthawk All-Terrain Tow Bar w/ LED Lights # RM-676 has a Locking tab up top that prevents the arms from pivoting down fully to the ground. If you don't fold the arms up and get the locking tab nut in the hole in the locking tab and then fold the arms down to either side the pivot point will allow the arms to fall all the way down. Having played with this before I can say it is a bit of a pain to get he pivot point lined up exactly to the locking tab perfectly so you might... view full answer...
I spoke to my contact at Tekonsha about the issue you are having with the T-One Vehicle Wiring Harness part # 118270 on your 2015 GMC Acadia. They said they have heard of this issue before but it is not very common. For starters, you will need to switch the orientation of the relays if they do not look like the ones in the attached photo. Unlike most relays, the pins are positioned in a way that will allow them to be installed incorrectly so you will need to check this first.
If the relays... view full answer...
I would start by checking to make sure each wire is connected in the correct location by function not by wire colors because colors can vary. Next, I would make sure ground wires are firmly connected and secured. After that, I would check all your wires with a circuit tester like Item # PTW2993. Finally, I would double check fuses and relays to make sure they are working.
I am attaching articles on brake controllers and troubleshooting that might help. view full answer...
Let's start with the easy stuff. Make sure the white ground wire on harness # 118451 is attached to a clean bare metal surface on your 2008 GMC Acadia. There can be no coating or paint and it works best if the wire is grounded by itself.
If that doesn't help then what is probably going on is the trailer lights draw more power than the vehicle wiring system can handle. You can test this by removing the connections to some of the lights. Then, if everything else starts working, including... view full answer...
For your 2013 GMC Acadia, the T-One Vehicle Wiring Harness for Factory Tow Package - 4-Pole Flat Trailer Connector # 118270 and similar wiring harnesses require installing the relays and fuses, so I recommend checking those locations for a bad relay since you have already checked fuses and wires. I've attached a video to assist.
You can use a circuit tester like # PTW2993 to check each function of your trailer wiring without a trailer connected to ensure function and isolate your possible... view full answer...
Hello Marv! I am happy to try to help you troubleshoot the wiring issues you are having on your 2011 GMC Acadia. This is an interesting issue you have described, and there are a few things you will want to check.
First, we want to confirm that we do in fact have a solid running light signal coming from your RV. The running light circuit should be at the "11 o'clock" pin on the RV 7 way. We suggest going in with a wire tester like part # PTW2993 and verifying that there is power to the... view full answer...
The Tekonsha T-One Wiring Harness # 118451 that you ended up installing is the correct harness for your 2012 GMC Acadia and it will work whether or not you have the tow package so you made the right choice there.
If you happen to have your trailer on hand, the first thing I recommend doing is simply hooking it up to the Acadia and plugging in your connectors. Sometimes those LED testers can be a little finicky so it's possible that the harness works perfectly and the tail lights on the... view full answer...
I would start checking fuses and relays on the power block in the engine bay. The cover should have a map or listing of all the fuses. Check all of the fuses that have anything to do with taillights or tow circuits. I have added a link to a wiring FAQ page that shows which pins should serve which function. Use the circuit tester like # PTW2993 to make sure everything is on the correct pins. view full answer...
The wiring harness you referenced, T-One 4-Pole Harness # 118451 from TowReady, uses plug-and-play connections to your Acadia taillight assemblies to generate lighting signals for your trailer. This harness provides trailer lighting signals on its included 4-pole connector that are completely independent of any factory tow package wiring that may be in place. Please take a look at the linked video which shows installation of this harness in your same year/make/model vehicle. The written... view full answer...
First you are going to want to make sure that the running light circuit is working on the trailer connector on the 2009 GMC Acadia. Use a circuit tester such as # PTW2993 to test the running light circuit. If it is not working, then check the vehicle owner's manual for the fuse location for the tow package running lights to check/change it. Also check the owner's manual for any relays that might be needed for the tow package wiring.
I do not recommend tapping into the running light wire... view full answer...
That is really interesting that you are having the same problem with the left running and turn signals on your trailer since you are seeing power on that pin for the T-One # 118271. If you check out the linked installation instructions you can see that the stop/turn and tail (running) light circuits have a max rating of 10 amps.
What you might want to try doing is testing both your trailers independently of your GMC Acadia. It would make sense that the turn signal wouldn't work on one... view full answer...
Check the fuse box in the engine compartment, it's on the passenger side. Remove the cover, and look for the fuse location labeled '*' or 'TRLR BRK' as shown in the diagram I've provided. Install a 30 amp fuse or replace it if it's blown.
I think what might have happened is that although your OEM brake pigtail might have the same wire colors except for the gray wire, the wires do NOT match up color for color to the brake controller wires. On your pigtail, the red wire is for 12-volt power,... view full answer...
The Tow Ready T-One Wiring Harness, # 118451, does not require any additional fuses or relays. As you said, this harness provides power to the trailer lights from the vehicles tail light circuits. The only time you would need to install a fuse is if one of the taillight fuses were blown on the vehicle. This would mean your taillights, turn signals or brake lights were not working on your Acadia.
If you are positive that you have a good ground and the T connectors are installed correctly... view full answer...
I'm sorry to hear about your hitch! Given that your vehicle is a non-AT4 model 2020 GMC Acadia, one of the common issues people have with hitches is bending/bowing of the hitch during delivery. If the angle on the welded end of the driver's-side brackets does not match the frame rail, it does indeed sound like an issue with bending/bowing of the Curt Trailer Hitch - 2" # C13293.
While we have not heard of the # C13293 not fitting your vehicle, bending/bowing is more common than people... view full answer...
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