Third brake light 7-Way Interface plug-in T Harness - 300100
- $ 11999 $ 119.99
Fits most trucks with 7 way trailer plugs #300100
Will not fit 2020+ Chevy with the Smart Tow and Advanced trailering system
Except 2015 -2022 Ford F150, 2016-2022 F-250 and 2016-2022 Toyota Trucks (Tacoma and Tundra)
Save time and hassle with the 7-Way Interface Harness. Installation takes as little as 7 minutes and gives you the ability to maintain your 7-way connector functionality and OE vehicle wiring. The 7-Way connects quickly and easily, with no need for cutting or splicing of wires.
Frequently Asked Questions
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Q: Does the 300200 Leer Wiring harness provide full-time hot wire power to the dome light on a topper?
A: Yes.
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Q: What is the difference between the 300200 & 300100?
A: 300200 is for the newer Fords and Toyotas that require external power source due to the smart towing system.It includes extra wire to run to the battery which is why there is more cost to it. The 300100 fits pretty much everything else
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Q: It is for a truck cap with LED center stop light?
A: Yes.
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Q: Does this install in behind the bumper so that it's concealed and the external bumper mounted plug still operates? Or does this connect to the external bumper plug itself and T from there?
A: Yes, they both install behind the bumper so that you can still use the external plug for your trailer and not affect usability
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Customer Reviews
I have been trying to find a solution to the blinking CMHSL for a long time. This worked so well and was super easy to install. Highly recommended!
I'm looking to purchase one of these, do you know when they will be available?
This was as easy as it says it is. It plugged into the 7 way harness easily. I routed the wire up through the body and connected it to the block in the shell. Great product. I recommend it to everybody.
When do you guys restock
I had a ARE Cap put on my truck, and they should offer to use this item. I would have been willing to pay the extra. I spent the afternoon figuring out the wiring to the cap third brake light and the accessories. Install the third brake light 7-way interface plug in harness was the easy part.
Simplest easiest install with no splicing required
damaged factory t harness had to buy complete gm harness 430.00 bucks this was a perfect fit for 110.00 easy fix
Third brake light 7-Way Interface plug-in T Harness - 300100
Purchased this kit to wire up a canopy on my 2021 Colorado zr2 Duramax. Worked great. Only issues I would say is the instructions I received said to cut the second white ground wire as the first step (which I thankfully didn't do) I needed it to wire the inside light. Used the 4 prong connectors. Only problem was I connected the 4 molex connector pins into the connector before running the wire thru the hole in the box. So I had to use a small brad nail and disconnect them , run the wire them reconnect. Everything works great. Also completely covered the plastic cover in electrical tape. So thankful I didn't let some shop hack into my factory wiring. Highly recommend for a truck on warranty can easily un install if needed. Pricey but you get what you pay for
Shipped quickly and worked as described. This is the easiest way to wire your truck cap third brake light.
Easy to install no need to cut wires or anything. Wish this was sold in Canada would have saved myself 50$ of nonsense duty fees. Or if it was shipped through FedEx as they have better shipping rates than UPS.
No frills, exactly what I needed. Easy install. Quick shipping.
Should have spent the little extra earlier, breeze to hook up and add a cargo light all at the same time.
This is a simple and unplug and plug in install. Is it a bit pricey yes, let's face it, if your getting this, most likely you just purchased a topper that was $1500-4500. It is made with factory style connectors that fit good and straight forward installation.
Third brake light 7-Way Interface plug-in T Harness - 300100
Installed on an 08 Silverado crew cab. I added more cable sheathing, zip ties, and electrical tape to keep it together, but it was straight forward to install.
Worked like a charm. Corrected an issue caused by the sales company that installed the cap
Fit perfect, great instructions, easy to install, worked like a charm. No complaints at all
Product finally works great. On 2011 Silverado 1500 it was plug and play except couldn't get dome light to work/get power. Instructions say check fuse...after much trouble shooting I discovered that the constant power from fuse box under hood to the trailer harness isn't hooked up from factory and factory doesn't provide the 40 amp low profile J case fuse either. You will find two red wires taped under hood in vicinity of fuse box that need to be connected to posts on front side of fuse panel using 1x M6 nut and 1x M8 flanged nut. Go buy the nuts and fuse and connect...This provides power to the auxiliary power terminal on 7 way trailer harness and thus dome light will work. Hope this helps someone. Review would not allow pictures to be uploaded. Search YouTube (not my vid) for 'trailer power wiring 2007 to 2013 chevy Silverado 12 volt auxiliary'
Love it! Easy as pie to install.
I had originally bought a $20 harness that needed to be spliced in, and while searching the depths of the internet to find which wire(s) and location to splice into, after about a day I found this in-line harness. Seeing as my truck is under warranty, this was worth the extra cost so I’m not modifying the existing harness. Plus, less than an hour to install, love it!
Great furnitures, great quality, loved the smalls silicone bags to isolate connections, and the multiple plugs options to complete my installation... Thx!
Great piece of kit. I could've used a picture of how the plugs come apart since I'm unfamiliar and a picture of which hole in the underbody to route the wire thru. But overall 5 stars because the alternative to this product is WORK!
What else can I say, I took my time, read the included instruction sheet, used the silicone protectant included, and woohoo! Interior light and 3rd brake light work as they should. I took my time, had a bit of trouble unlatching the factory connector because it was so cold, but still only took maybe an hour for my first time doing this job.
I would definitely recommend this and purchase it again from EZ WHEELER if needed.
Ordered 14 days ago and shipment tracking shows item sitting idle in Fort Wayne, IN
Look good
this product made installation super easy
3rd 7-way brake light cf-type-wiring-harness cf-vendor-leer harness leer third