No lights while towing - 7 pin issue?

System · March 2021

This discussion was created from comments split from: Need advice on solar suitcase for T@B 320S.

Harwoodmary · March 2021

Running lights- need some help here, friends. Took our Tab 320S 2018 for a test drive. The 7pt plug was not relaying power to running lights (brake, turn signals). This is a new development. Everything else is good. Thots?

pthomas745 · March 2021

Clean your 7 pin plug, first. There are "contact cleaners" out there.

And a bunch of threads.

https://www.google.com/search?client=firefox-b-1-d&sxsrf=ALeKk03N1MM1LfECw8RhB725BZierUS1LA:1615477634662&ei=gjtKYKr2J5Th-gTI47boAw&q=no+running+lights+site:tab-rv.vanillacommunity.com&oq=no+running+lights+site:tab-rv.vanillacommunity.com&gs_lcp=Cgdnd3Mtd2l6EAM6BwgAEEcQsANQnhNY30VgsUxoAXACeACAAVWIAegRkgECMzSYAQCgAQGqAQdnd3Mtd2l6yAEEwAEB&sclient=gws-wiz&ved=0ahUKEwiqv7mUy6jvAhWUsJ4KHcixDT0Q4dUDCAw&uact=5

N7SHG_Ham · March 2021

As said, clean, then determine if signal is getting to plug, kind of a divide and conquer method. If power is getting to plug and still no go after cleaning, then it is trailer someplace and if all lights are dead, then I would look for what is common which is probably the ground wire. All the pigtail wires go to a junction box near front exterior of trailer and that would be 1st place to look for wiring issues on trailer.

Hopefully just a cleaning of both ends of the seven way is all that is needed.

Denny16 · March 2021

Also check the TV connection, to make,sure it is clean and working properly.
Next is the junction box just under the front of the trailer. You can run a continuity check with a meter between the 7-pin and the junction box connections. My bet is the TV 7-pin has failed, not the trailer.
cheers

MuttonChops · March 2021

@Harwoodmary; Any progress on resolving your running/turn signal light issue?

You did not comment on your tow vehicle make/model/year or if your 7-Pin was factory or aftermarket installed. All items that could allow better advice on things to check out.

As an Example: Most but not all vehicles have Fuses on the 7-Pin circuits . . . most common on factory installed 7-pins.

Denny16 · March 2021

Good point, Checking TV fuse is a grand idea. The only time I had a similar issue with trailer lights not working, turned out to be the TV fuse on the factory 7-pin harness.
cheers

webers3 · March 2021

Invest in a 7 pin tester, you will quickly determine if it's the TV 7 pin connector problem, or not
https://www.amazon.com/MICTUNING-Blade-Trailer-Connector-Tester/dp/B07JKWKGFQ/ref=sr_1_2_sspa?crid=3HSCFWY8VOQX4&dchild=1&keywords=7+pin+trailer+tester&qid=1615727476&sprefix=7+pin,aps,179&sr=8-2-spons&psc=1&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUEzOTg3QVo5M0I1VU9EJmVuY3J5cHRlZElkPUEwNDI0MTM1MzVJMUxKOUVDRDRLSSZlbmNyeXB0ZWRBZElkPUEwNjQ4MDg4MUpJQ0Q2M0I4STNEWSZ3aWRnZXROYW1lPXNwX2F0ZiZhY3Rpb249Y2xpY2tSZWRpcmVjdCZkb05vdExvZ0NsaWNrPXRydWU=

Michigan_Mike · March 2021

Always start at the source and work your way back to the trailer. Voltage indicator, check battery fuse, connections made at (or behind) the 7 pin tow vehicle assembly, source wire frayed or cut under vehicle between battery and 7-pin connector, bad or loose splice, etc. Most likely at the TV side and checking for voltage at the 7-pin TV assembly will tell a lot.

No lights while towing - 7 pin issue?

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