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

11 reviews
  • $ 109.99


Fits most trucks with 7 way trailer plugs  #300100

Will not fit 2020+ Chevy with the Smart Tow and Advanced trailering system

Except 2015 -2021 Ford F150, 2016-2021 F-250 and 2016-2021 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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3rd 7-way brake light cf-type-wiring-harness cf-vendor-leer harness leer third