Taillight to Trailer harness issue

[Barty88]

Similar (but not the same) issues have been discussed and I cannot find the answer, here. My truck is a new style 2019 1500. Everything on the truck works in terms of lighting. Everything on the trailer works if given power. The pigtail on the trailer is brand new. However, wires connected correctly, the marker (running, parking, whatever you call them) do not work. If I touch the auxiliary (constant) power to the marker light wire on the trailer the lights work... so its not an issue with the trailer wiring or lights. I would think the issue lies between the taillight and the wiring harness, but... I've also read different things in older models about how Ram ran these connections independently, or with other circuits. Anyone else have this issue? Ideas on how to troubleshoot?

 

[Tulecreeper]

Similar (but not the same) issues have been discussed and I cannot find the answer, here. My truck is a new style 2019 1500. Everything on the truck works in terms of lighting. Everything on the trailer works if given power. The pigtail on the trailer is brand new. However, wires connected correctly, the marker (running, parking, whatever you call them) do not work. If I touch the auxiliary (constant) power to the marker light wire on the trailer the lights work... so its not an issue with the trailer wiring or lights. I would think the issue lies between the taillight and the wiring harness, but... I've also read different things in older models about how Ram ran these connections independently, or with other circuits. Anyone else have this issue? Ideas on how to troubleshoot?

Check your fuse box?

 

[jr27236]

I was going bonkers on mine when I finally realized that I had the lights on auto instead of constant and the truck didn't allow them on lol?? .if that doesn't work. Go get a simple test light and test each pin in you truck. It will take 5 minutes.

 

[18CrewDually]

Check your fuse box?

Like he said ^^

I believe it's fuse #29 under the hood.

Dodge Ram 1500 2019 Fuse Box - Fuse Box Info | Location | Diagram

Fuse Box Information | Dodge Ram 1500 2019. Dodge Ram 1500 2019 Fuse Box Diagram. Dodge Ram 1500 2019 Fuse Box Scheme. Dodge Ram 1500 2019 Fuse Box Layout. Dodge Ram 1500 2019 Fuse Panel. Locate fuse and relay on your vehicle.

fuseboxinfo.com

 

[rzr6-4]

Worst case scenario is a TIPM issue/failure, but the suggestions above are more likely.

 

[TRK_GANG74]

I second that motion from post #3 makes sure your headlights are not in Auto.

 

[turkeybird56]

Like he said ^^

I believe it's fuse #29 under the hood.

Dodge Ram 1500 2019 Fuse Box - Fuse Box Info | Location | Diagram

Fuse Box Information | Dodge Ram 1500 2019. Dodge Ram 1500 2019 Fuse Box Diagram. Dodge Ram 1500 2019 Fuse Box Scheme. Dodge Ram 1500 2019 Fuse Box Layout. Dodge Ram 1500 2019 Fuse Panel. Locate fuse and relay on your vehicle.

fuseboxinfo.com

Trailer running lights is a 20 amp "Blue" cartridge fuse. Also, U may have a bad ground on yer trailer. On my DT 2019 truck, I cannot plug in my trailer to the truck when the truck is on, lights, etc.,. I have to power down then plug in, or I will Blow the running lights cartridge fuse every time. I Gotta have a bad ground somewhere, just too lazy to look for it.

 

[turkeybird56]

I second that motion from post #3 makes sure your headlights are not in Auto.

U know, I personally have never checked that, because when I tow with my DT truck, I always turn on the headlights for safety, and not by the Auto switch where mine normally stays, but by turning the headlight knob to headlights. The way fools drive these days, who knows, but I do every thing I can do to try and be seen.

Just like my MC. My Big Honda has "4" Headlights on 24/7 yet PPL say then never see me when they turn in front of me, idjuts, IMHO.

 

[jr27236]

The last time I hooked up my cargo trailer in the evening. Everything was fine and then they went off. I couldn't get them to go back on
All fuses were perfect. I had to switch everything off, start the truck, turn lights back back on and they all illuminated. It was like the truck canceled them out to save power when not started, it was frustrating as hell, but all was resolved

 

[zrock]

definitely make sure you r lights are not on auto