UPDATED 12/15/25 I need a little help about the Rambox "Jumper Wiring Harness"

[2001gw]

I have a 2021 RAM 1500 Limited with Ramboxes. Shortly after I purchased it (in 2021) the left Rambox started popping open by itself. I unplugged the connector at the latch to stop it from happening. About two weeks later I decided to plug it back in and see what happened. That was 4 years ago. It never popped open again…until recently.

About a month ago it started popping open again. I tried unplugging the connector again for a couple of weeks but the problem still exist.

While searching the problem and solutions on this site, I came across several comments about a “Jumper harness.” I have since ordered and received the harness.

My question is: Do I simply remove the old harness and replace it with the jumper harness and the problem is solved?

Thanks.

 

[UglyMonk3y]

did you figure out how to swap the harness? did it fix the problem?

 

[2001gw]

I'm sure you're going to find this truly sad....I"ve had the harness since June but have not gotten around to installing it!

When I do get "around-to-it", I will update this thread and report the results.

 

[MannyN]

I'm sure you're going to find this truly sad....I"ve had the harness since June but have not gotten around to installing it!

When I do get "around-to-it", I will update this thread and report the results.

Here is one, now install it.

 

[2001gw]

 

[UglyMonk3y]

not sure if this is a permanent fix but... 2 weeks ago, after going thru one of those automated car wash, my left rambox started behaving randomly!! different behavior everyday for a week. it went from the box opening whenever it wants (even going 70 mph on the freeway), to opening after starting the truck, to opening after I shutdown the truck, and every 5 sec or 1 minute after shutdown. it even opened when the back passenger door opened. I resorted to electrically disconnecting it for a few days.

last weekend, I removed the connector (circled in red) that connects the box to the truck and didn't find anything odd, sprayed a lot alcohol in the connector (both ends), air dried for a few hours, applied some dielectric grease (both ends), reconnected. the light in the box and the latch didn't work... I thought - FACK!! I started the truck, turned it off... everything worked as before. it's been a few days, no more gremlins. I'm going thru the car wash again soon... we'll see.

 

[2001gw]

 

[2001gw]

I finally “Got around tuit”!... and it’s not good news.

This weekend I decided it was time to install the “Jumper harness” that is supposed to stop the left Rambox from randomly opening at it’s own will. (the harness that I purchased last June).

First, the hardest part of the job was disconnecting the electrical connector under the truck that goes to the Rambox. I spent more time on that than I did unbolting and removing the Rambox.

After putting it all back together, the Rambox will not open with the push-button as it should, also the lights inside the box do not come on when I push the switch. The first thing I did was check to see if I had 110 v at the high voltage outlet at the rear of the box. I plugged in one of those “handy home owner testers with the 3 lights” into the receptacle and I got 2 lights to come on (the red and 1 yellow)…looking at the legend on the tester that means that I have an open ground. That would also probably account for the lights not coming on. So, either I have a bad replacement harness, or something is not making contact inside one of the three connectors. I will pull it out again soon, check the harness for continuity and see what I find.

I’m hoping the problem isn’t the connector coming from the truck to the harness. I have attached a photo of the original connector. Before putting it all back together, I did spray contact cleaner into the connector coming from the truck to the Rambox harness.


I removed the Rambox and the harness (again). I checked all wires at all the connectors for continuity. All are good, and still no lights and box won't open when pushing button on lid.

The only thing I can conclude is the connector that connects to the Rambox harness is so corroded inside the connector that it is not making contact. I’ll search around to see if I can order that part of the harness that contains connector.

The photo below is one side of the old connector (the other side is worse).