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Tail Light Wiring for Trailer

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Old Aug 28, 2025 | 10:29 AM
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2018 E300
Tail Light Wiring for Trailer
Hi,
I am trying to install trailer wiring i my 2018 E300 sedan using Tekonsha ZCI non contact wiring kit. I am trying to confirm which wires control which functions. Using a voltmeter I think the following may correct

:Left Side Harness
Turn signal - gray wire

Right Side Harness
Turn Signal - red wire (also green wire with black stripe)
Running Lights - green wire with black stripe
Brake Lights - gray wire with yellow stripe

Can anyone confirm this?

Thanks!
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Old Aug 28, 2025 | 11:09 AM
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Trunk right side fuses 444, 445, 446, 447 and 448 are listed specifically for trailer hitch.
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Old Aug 28, 2025 | 11:13 AM
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2018 E300
Originally Posted by ua549
Trunk right side fuses 444, 445, 446, 447 and 448 are listed specifically for trailer hitch.
Interesting! Maybe I can plug directly into the fuse locations. I will test them with my voltmeter.
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