No tail lights/marker lights

[ait109]

2022 Odyssey 25R.

Just realized my taillights and (rear) marker lights are out. Brake lights, reverse lights, and turn signals are still working. Too hot and dark out right now to start taking a look.

Any ideas that I can start with once it gets light out in the morning?

[Jagiven]

I doubt it is a grounding issue, as other lights in the unit work.

I would first check the fuses and relays.

Could be a bad wiring connection between where the coach frame and where Jayco plugged in the frame harness. To find that crawl under the MH.

[Happy wife / happy life]

Do your headlights work? The taillights and markers are run threw the headlight switch. I’m not familiar with your rig but I would 1st check to see if you have a headlight fuse. As “ Jagiven “ said then move on to your wiring connections. Best of luck to you!

[ait109]

All the chassis lights work except for the tail lights. Brake lights and reverse lights are working. Front parking lights in the chassis are working. Turn signals and hazards work.

Front marker lights on top of the cabover are not working. Rear marker lights are not working. Rear tail (parking) lights are not working.

I'm getting a good tail light signal to the towing harness. If I can't figure this out in the next hour I'll just use my magnetic tow lights on the bumper for this weekend's trip.

[Grumpy]

As Jagiven said check the fuses. If I remember correctly, there are two, one for the towing harness and one for the lights on the box itself.

[ait109]

The 2022 Ford manual doesn't specifically call out a taillight or license plate fuse and I checked every thing related to lights and/or upfitter and they all visually check out. I'll test again with a multimeter once I get to a cooler location. No obvious wiring problem underneath the chassis. I tried to remove my rear left taillight assembly to check power but it's too caulked in and I'm on a timeline to get underway.

Thanks and I'll give an update in a few days.

[ait109]

Took it to the dealer for some other warranty issues. Of course the lights worked when I got there. They took a quick look and couldn't find anything loose.

Did 4 hour drive after sunset this week, I could see that the marker lights stayed on the entire drive through my side view mirrors.

This is a very unsatisfactory resolution for me.

[ait109]

Took it to the dealer for some other warranty issues. Of course the lights worked when I got there. They took a quick look and couldn't find anything loose.

Did 4 hour drive after sunset this week, I could see that the marker lights stayed on the entire drive through my side view mirrors.

This is a very unsatisfactory resolution for me.

[Scoutmaster253]

Originally Posted by ait109

Took it to the dealer for some other warranty issues. Of course the lights worked when I got there. They took a quick look and couldn't find anything loose.

Did 4 hour drive after sunset this week, I could see that the marker lights stayed on the entire drive through my side view mirrors.

This is a very unsatisfactory resolution for me.

The vibration from the trip caused some corroded connection somewhere to wear itself back together, re-making the connection. It will be fine until you park it again for a longish length of time.