CHMSL wire tap for topper

[UncaBuddha]

Got the top all wired up today. That wiring harness worked like a champ! Going to go camp out in the back this upcoming week and check for leaks etc.!

 

[NorthStar]

Got the top all wired up today. That wiring harness worked like a champ! Going to go camp out in the back this upcoming week and check for leaks etc.!

Agree! The Leer wiring harness is priceless.

 

[TNRamGuy]

Yes, Robalo2718 you are correct. My 2021 1500 Laramie has this pigtail (white/purple tracer) capped in black shrink wrap in the exact location as Ammdrew's diagram on post#48. You only need to take off a wrap or two of the fabric tape to access--I could actually feel the end cap under the wrapping. The rest of the harness can be left alone. This makes hookup of the CHMSL super easy (just connect the ground to the frame somewhere). No need for extra harnesses and logic modules to tap into the 7-pin trailer harness. Thank you everyone for your help!

Now, to figure out where to tap into to hook up the dome light so it works in conjunction with the factory LED bed lighting...

View attachment 78329

I found the pigtail also, was on top of the frame with about 1/4" sticking out, it was not visible from below but easy to feel. It was taped to the top of the wiring harness directly above the hitch bolt.

 

[jojo7070]

Hey everyone,
I have 2020 2500 with Aux switches, turned out that the factory runs wires to the back of the truck for Upfitting.
It took me a while to find them, plus you also need to connect inside the truck above the parking brake to the grey jumper that comes with the Upfitter kit.

(*These two circuits become active when the 6 cavity Light Gray connector (Jumper por Upfitter 2) included in the Upfitter kit is installed onto the Light Gray connector at location D in the vehicle diagram)

https://www.ramtrucks.com/BodyBuilder/service/Image?imageId=MtQrP%2FFqLY5r%2Fest8MtGjGgHzAHGUTU0WB3rWuqSY7YmQ2vEhuBWBAGmP39EZ2yd%0A

This link should give you all the information you need to set up a 3rd break or connect lights or any other stuff without running any new wires from the Aux plugin

 

[Campinram]

So just to clarify, has anyone found this wire on the 2019's? Or is it MIA til 2020 models? I've looked and can't find it on mine.

 

[NorthStar]

My 2019 did not have it. My 2020 does have it. My coworkers 2021 has it.

 

[Jako]

So just to clarify, has anyone found this wire on the 2019's? Or is it MIA til 2020 models? I've looked and can't find it on mine.

Couldn't find it on my 2019.

 

[NorthStar]

To be honest, I didn’t utilize the pigtail even though my truck has it. Instead, I splurged and purchased the kit below which a much cleaner installation as it provided the brake light as well as power for the interior lights of the topper.

Third brake light 7-Way Interface plug-in T Harness - 300100

Fits most trucks with 7-way trailer plugs #300100 Will not fit 2020+ new body style Chevy / GMC trucks with the Smart Tow and Advanced trailering system and 2015-2024 Ford F150, 2016-2024 F-250 and 2016-2023 Toyota Trucks (Tacoma and Tundra) Instructions

www.ezwheeler.com

 

[sheepdogtrail]

I found the pigtail also, was on top of the frame with about 1/4" sticking out, it was not visible from below but easy to feel. It was taped to the top of the wiring harness directly above the hitch bolt.
View attachment 85279View attachment 85280View attachment 85281View attachment 85282

My 2021 BigHorn EcoDiesel also has the pigtail in this same location. I will be wiring up my 2014 EcoDiesel ARE X series topper (it fits 99% of the way, which is good enough for me) to it in a couple of days. My wire I believe is just white as my eyes can only see white on something that small. But it looks exactly like this one in the pictures above.

 

[jellis466]

I have an ARE V series with the dome light and LED strip lights that i just bought off a truck at a dealership. Where do i tap into to get the LED and dome lights working?? my truck doesnt have the OEM bed lighting

 

[NorthStar]

I have an ARE V series with the dome light and LED strip lights that i just bought off a truck at a dealership. Where do i tap into to get the LED and dome lights working?? my truck doesnt have the OEM bed lighting

See Post #88 above for an easy method.

 

[Ratfink]

Has anyone done this yet? Still looking for good options while I wait for toppers to release

Well I have a 2021 RAM, built Aug 9, 2021. I purchased a Y-connector harness that tees off the 7 pin connector, from eTrailer, and converts to 4-pin pig tail. Added a 4-pin extention and ran covered up behind tail light into truck bed along with a power wire that I soldered into Aux-12 volt off the 7-pin. Ordered a $15.00 electronic connector that, connects into my 4-pin trailer harness and converts turn/brake lights on harness into brake light.

 

[kbraunphoto]

To be honest, I didn’t utilize the pigtail even though my truck has it. Instead, I splurged and purchased the kit below which a much cleaner installation as it provided the brake light as well as power for the interior lights of the topper.

Third brake light 7-Way Interface plug-in T Harness - 300100

Fits most trucks with 7-way trailer plugs #300100 Will not fit 2020+ new body style Chevy / GMC trucks with the Smart Tow and Advanced trailering system and 2015-2024 Ford F150, 2016-2024 F-250 and 2016-2023 Toyota Trucks (Tacoma and Tundra) Instructions

www.ezwheeler.com

Anyone have another place that has this harness?
I can't get their site to load.

 

[NorthStar]

Anyone have another place that has this harness?
I can't get their site to load.

I tried it just now and the link works fine.

Third brake light 7-Way Interface plug-in T Harness - 300100

Fits most trucks with 7-way trailer plugs #300100 Will not fit 2020+ new body style Chevy / GMC trucks with the Smart Tow and Advanced trailering system and 2015-2024 Ford F150, 2016-2024 F-250 and 2016-2023 Toyota Trucks (Tacoma and Tundra) Instructions

www.ezwheeler.com

 

[kbraunphoto]

I tried it just now and the link works fine.

Third brake light 7-Way Interface plug-in T Harness - 300100

Fits most trucks with 7-way trailer plugs #300100 Will not fit 2020+ new body style Chevy / GMC trucks with the Smart Tow and Advanced trailering system and 2015-2024 Ford F150, 2016-2024 F-250 and 2016-2023 Toyota Trucks (Tacoma and Tundra) Instructions

www.ezwheeler.com

gotta love technology.... still doesn't work on my end but ill try and fight that battle another day.

Looking to make sure it works with this [see attached] I have partially installed; albeit hacked away at when the previous owner sold it to me:

https://www.truckaccessorizer.com/Topper-Fuse-Box-Wire-Harness.html

 

[NorthStar]

gotta love technology.... still doesn't work on my end but ill try and fight that battle another day.

Looking to make sure it works with this [see attached] I have partially installed; albeit hacked away at when the previous owner sold it to me:

https://www.truckaccessorizer.com/Topper-Fuse-Box-Wire-Harness.html

It should.

 

[Warpspider]

Hello, I was wondering if someone could post picture of the wiring diagram from the

Leer Third brake light 7-Way Interface plug-in T Harness - 300100​

Installation instructions.

Thank you

 

[Alleyesonme]

Yes, Robalo2718 you are correct. My 2021 1500 Laramie has this pigtail (white/purple tracer) capped in black shrink wrap in the exact location as Ammdrew's diagram on post#48. You only need to take off a wrap or two of the fabric tape to access--I could actually feel the end cap under the wrapping. The rest of the harness can be left alone. This makes hookup of the CHMSL super easy (just connect the ground to the frame somewhere). No need for extra harnesses and logic modules to tap into the 7-pin trailer harness. Thank you everyone for your help!

Now, to figure out where to tap into to hook up the dome light so it works in conjunction with the factory LED bed lighting...

View attachment 78329

First time poster
2021 ram 1500 with the lights in the bed
Just got a new leer cap with a dome light
I’ve found the white and purple wire under the truck and a good spot for a ground I think, but where do I hook the third wire up to have the dome light work in conjunction with the bed lights?
I’m assuming to the red wire that’s behind the drivers side light that has the power button
Thank you

 

[Alleyesonme]

First time poster
2021 ram 1500 with the lights in the bed
Just got a new leer cap with a dome light
I’ve found the white and purple wire under the truck and a good spot for a ground I think, but where do I hook the third wire up to have the dome light work in conjunction with the bed lights?
I’m assuming to the red wire that’s behind the drivers side light that has the power button
Thank you

 

[CogitoErgoLevo]

Thanks to this thread I was able to locate the white/purple wire under the bed and wire the 3rd brake light of my camper.
The installer wanted to charge me $150 to splice the wires under the driver's door jamb to wire the 3rd brake light. I told him about the wire under the bed but he laughed at me....
Thanks again