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Old 08-20-2021, 06:22 PM   #1
1 Rivet Member
2018 20' Flying Cloud
Seattle , Washington
Join Date: Jun 2020
Posts: 16
Running lights not working. 2018 FC 20fb

Our running lights arenít working. The brake light and turn signals are fine. We cleaned the 7 way plug. We think the next step is to check the fuse but what fuse? Any other ideas? Thank you!
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Old 08-20-2021, 07:19 PM   #2
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2013 25' FB Flying Cloud
Longmont , Colorado
Join Date: Jan 2012
Posts: 1,103
Do the running lights work on your tow vehicle?

I don't think the trailer has a fuse in the running light circuit, but the tow vehicle certainly does.

There is a way to test the running lights without a tow vehicle. If you read the following thread, you will see that a few people like to light up their running lights while parked at camp. This can be done by jumpering two connections in the trailer 7-pin cord. You use an automotive-type plastic blade fuse to do it (the same type Airstream has used in its trailers for many years). If you stick the fuse in the right place, the lights should come on.

If the lights come on when you insert the jumper, then the problem is in the tow vehicle.

If not, the problem is in the trailer. The next thing to do is find the other end of the seven-pin cord. I've never seen the wiring in a 20 footer, but in most models, the cord comes up through the floor in the curbside front corner, and then goes to a plastic box where the 7-pin cord wires connect to wires in the trailer wiring harness. You need to find the box, open it, and inspect for loose connections, broken wires etc. You can also test the seven-pin cord here using a voltmeter (connect the seven-pin to the trailer, or jumper it as described in the other thread, then test for voltage on the wire inside the box).
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Old 08-20-2021, 08:03 PM   #3
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2017 30' Classic
2022 Interstate 24X
Carlisle , Pennsylvania
Join Date: May 2017
Posts: 15,641

Another way to check out the TV side of things is with one of these gizmos:

A multimeter does just as good a job of testing. The only advantage of the gizmo is that it already has the pins sorted out and the LED's labeled. It might eliminate one layer of confusion .....

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Old 08-20-2021, 09:50 PM   #4
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2018 27' International
Conroe , Texas
Join Date: Aug 2018
Posts: 28
Most of the newer tow vehicles have a separate fuse for running lights. Consult the owner manual for your TV to identify the exact fuse. Normally it is a 5 amp fuse in the engine compartment.
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Old 10-20-2021, 12:39 AM   #5
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2018 25' International
Bakersfield , California
Join Date: Feb 2019
Posts: 24


I had a similar problem. Check my past post above.
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Old 10-23-2021, 11:42 AM   #6
1 Rivet Member
2018 20' Flying Cloud
Seattle , Washington
Join Date: Jun 2020
Posts: 16
Hi all - it turned out our running lights werenít working because the cable attached to the 7 way plug was damaged which caused a short and blew fuses in the TV We took the trailer to an airstream electrical specialist While it was there, the solar controller under the bed caught fire because it wasnít attached to the wall, jiggled loose and the wires shorted He said the controller had not been properly attached to the wall Fortunately, he caught the fire before there was damage other than to the controller and wires Everything appears fine now We appreciate your assistance and that of an independent RV repair shop in Bellingham who first diagnosed the problem
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