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Hello all!
I just spend about 4 hours in the garage installing and troubleshooting the Curt Bronco Custom 4-Way Flat Output Trailer Wiring Harness for 2021+ models with LED tail lights (Curt Part #56468). It probably should have been a 1-1.5 hour job. I learned a few things along the way that I think might help others if you end up installing this wiring harness. I did a couple of quick searches from my phone and didn't find answers, so I'm making a quick post that hopefully shows up in search results.
After completing the install, I had two issues. First, my rear passenger blinker was not working. I was getting a hyper blink when I turned on the right side blinkers, and when looking at the lights, nothing was flashing. Second, when I hit the brakes, the brake lights (red) AND turn signal lights (orange) would come on for both rear lights. If I turned on the left blinker while brakes were applied, I would also get a hyper flash for the rear driver blinker not working.
After chasing gremlins for about an hour, I found two things that I did wrong. One was my fault, as I didn't want to drill into my Bronco for a ground point (like the instructions said to do), so I picked a bolt that was not an adequate ground. Once I found a good ground, the driver side tail light started working as intended. For those curious, I split the ground wire off back below the bumper and used one of the bolts holding the bumper to the frame for a ground. I did have to open the connecter up a bit to for it on the bolt. The other thing I did wrong was following the wiring diagram...
I found that connecting the power wire on the harness to the battery, as the diagram and instructions said to do, caused half of the issues I was experiencing. For some reason, when the harness is connected to power, the rear lights had an aneurism and couldn't figure out what lights need to go on. I disconnected the power wire from the battery after fixing the ground point, and everything worked as intended.
To keep it short, if you're installing this wire harness on your Bronco, make sure you have a good ground point, and follow the instructions. If that doesn't work, try disconnecting the power wire and see if that fixes your issues.
Hope this post helps someone out!
I just spend about 4 hours in the garage installing and troubleshooting the Curt Bronco Custom 4-Way Flat Output Trailer Wiring Harness for 2021+ models with LED tail lights (Curt Part #56468). It probably should have been a 1-1.5 hour job. I learned a few things along the way that I think might help others if you end up installing this wiring harness. I did a couple of quick searches from my phone and didn't find answers, so I'm making a quick post that hopefully shows up in search results.
After completing the install, I had two issues. First, my rear passenger blinker was not working. I was getting a hyper blink when I turned on the right side blinkers, and when looking at the lights, nothing was flashing. Second, when I hit the brakes, the brake lights (red) AND turn signal lights (orange) would come on for both rear lights. If I turned on the left blinker while brakes were applied, I would also get a hyper flash for the rear driver blinker not working.
After chasing gremlins for about an hour, I found two things that I did wrong. One was my fault, as I didn't want to drill into my Bronco for a ground point (like the instructions said to do), so I picked a bolt that was not an adequate ground. Once I found a good ground, the driver side tail light started working as intended. For those curious, I split the ground wire off back below the bumper and used one of the bolts holding the bumper to the frame for a ground. I did have to open the connecter up a bit to for it on the bolt. The other thing I did wrong was following the wiring diagram...
I found that connecting the power wire on the harness to the battery, as the diagram and instructions said to do, caused half of the issues I was experiencing. For some reason, when the harness is connected to power, the rear lights had an aneurism and couldn't figure out what lights need to go on. I disconnected the power wire from the battery after fixing the ground point, and everything worked as intended.
To keep it short, if you're installing this wire harness on your Bronco, make sure you have a good ground point, and follow the instructions. If that doesn't work, try disconnecting the power wire and see if that fixes your issues.
Hope this post helps someone out!
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