Led tailgate light bar on 25's trailer light errors

[Kilroy]

So I had an OPT7 60" Redline Triple Row LED Tailgate Light Bar w/Sequential Amber Turn Signal on my 2021 Limited, so before I traded it I took it off along with the 7 pin to 4 pin trailer connector adaptor. It has a 7 pin male connector on one side and a 7 pin female on the other, you unplug the trailer connector from the back side of the bumper, and place this cable between the original plug and the socket (Back side of the bumper). The you get a pigtail with a 4 pin connector on it. Then you can plug the led light bar into that. My bad for not "testing" the setup before installing, but now with the light bar plugged in, I get an error on the dash indicating there is a problem with the trailer lights.
I have seen on OPT7's website that they had issues wit hthe turn signals not working on the newer F-150's and the sell a cable system that plug in between the tail lights they call it vehicles with (BLIS), however the light bar works perfectly, brake, turn, hazard, and backup lights. Any one had a similar situation on the newer RAM trucks?

 

[Kilroy]

So I have discovered the issue. OPT7 knows about the issue, and has already addressed this with the Ford F-150 and a couple other trucks by making a wiring harness that plugs into the rear taillight then to the tailgate light bar. However they have no plug-n-play solution for the newer RAM trucks. So I will have to take it upon myself to design a module (as I have done for other applications for example my BMW GS1250A, and the Triumph Tiger models) with a small box with MOSFET's that can be triggered by the outputs of the trailer controller/plug (7 pin) that uses a small signal input to trigger a higher current load (LED Light bar) that should prevent the computer from thinking a trailer is attached. When I have some success I will report back and let you know my progress. The vision would be a module that has a male and female 4 pin plugs that would go inline with the led light bar.

 

[Kilroy]

Module completion and works as expected

 

[Kilroy]

Video of the final working module and light bar:

 

[Kilroy]

Received my 10 pack of connectors for the taillights so I can start fabricating my inline connections to the taillights. Hopefully this will eliminate some of the delay in the light bar.

 

[Kilroy]

So on this topic, anyone know the pinout what wires are what on this plug. it is an 8 pin wire: I will post the photos of the connector.

 

[Kilroy]

 

[Kilroy]

So Looks like:

Black - Ground (Duh!)
White with Yellow band: Turn Signal
Red - Hot running light
Guess I will have to hook a volt meter to them and test. Hopefully there are no processors in there at are digital signals that activate the light based on the CANBUS system lol

 

[Jimmy07]

View attachment 196667View attachment 196668

In order of positions:
1) black- ground
2) yellow- stop/turn signal
3) white/grey stripe- park lamp
4) white/tan stripe- backup lamp
5) white/blue stripe- Lin bus
8) red/blue stripe- constant battery +

 

[Kilroy]

In order of positions:
1) black- ground
2) yellow- stop/turn signal
3) white/grey stripe- park lamp
4) white/tan stripe- backup lamp
5) white/blue stripe- Lin bus
8) red/blue stripe- constant battery +

Thank you! So the stop turn works similarly to the trailer connector. Strange.

 

[Kilroy]

In order of positions:
1) black- ground
2) yellow- stop/turn signal
3) white/grey stripe- park lamp
4) white/tan stripe- backup lamp
5) white/blue stripe- Lin bus
8) red/blue stripe- constant battery +

What about the white with yellow?

 

[Jimmy07]

Thank you! So the stop turn works similarly to the trailer connector. Strange.

Yes, they’ve gone back to the archaic combined rear lighting for some strange reason.

 

[Jimmy07]

What about the white with yellow?

If you’re referring to the one circled below, it’s called out as white/beige (I called it white/tan). That’s why I used the connector position numbers too:

 

[Kilroy]

Yes, they’ve gone back to the archaic combined rear lighting for some strange reason.

Well that's just poopie! Do you know if both turn signal wires are on the tail lights now, or are they seperate? Am I going to have to tie into both lights to get both turn signals?

 

[Jimmy07]

Well that's just poopie! Do you know if both turn signal wires are on the tail lights now, or are they seperate? Am I going to have to tie into both lights to get both turn signals?

The left stop/turn and right stop/turn wires are two separate circuits from the bcm.

 

[Kilroy]

The left stop/turn and right stop/turn wires are two separate circuits from the bcm.

You don't happen to have a complete wiring diagram of the 25's do you?

 

[Skater]

Kilroy --

I DM'd you.

 

[firemedic10584]

I added two additional rear lights under my tailgate (Soundoff Mpowers) that are dual color red/white. I had to tie the left light to the left tail light wiring and the right to the right tail light to get it all to work properly. I initially tied into the trailer wiring, but kept getting errors on the dash and it thought there was a trailer connected. But the lights function as brake, turns and reverse. No issues now.

 

[Skater]

I added two additional rear lights under my tailgate (Soundoff Mpowers) that are dual color red/white. I had to tie the left light to the left tail light wiring and the right to the right tail light to get it all to work properly. I initially tied into the trailer wiring, but kept getting errors on the dash and it thought there was a trailer connected. But the lights function as brake, turns and reverse. No issues now.

Are your new lights LED or halogen? Were they initially wired for the blade trailer plug, and you split them up, or were the new lights designed to be connected directly to your existing tail light wiring setup? I have the OPT7 sequential light bar, and I have the same issues Kilroy had. With the sequential LEDs, I'm not sure direct wiring to the turn signals works, but if all else fails, I will try that.

 

[firemedic10584]

Are your new lights LED or halogen? Were they initially wired for the blade trailer plug, and you split them up, or were the new lights designed to be connected directly to your existing tail light wiring setup? I have the OPT7 sequential light bar, and I have the same issues Kilroy had. With the sequential LEDs, I'm not sure direct wiring to the turn signals works, but if all else fails, I will try that.

My lights are actually typically used for emergency vehicles, I'm just using them for another purpose since they're insanely bright and very sleek look. They are LED. I did not have any tailgate lightbar or anything. I initially just wired my new lights to the trailer wiring since the wiring is right there and easy to access. But the dash errors weren't going to work so I tried wiring to the tail lights instead and that cleared everything up.