All Trailer Lights Flash When Using Turn Signals and Running Lights

Question

Question:

My camper lights work normal until i turn on parking lights then everything looks as it should until i use turn signal on either side the whole back flashes tail and clearance as well as 2 side on back

asked by: Jim T

0

Expert Reply:

There could be a few potential problems here. Since the lights work as they should until the running lights come on, then the issue is most likely on the trailer. Problems like this are typically associated to a poor ground connection.

To make sure the problem is isolated to the trailer, I recommend using a simple light tester, like part # PTW2993, to test the trailer connector on your tow vehicle to make sure it is functioning properly. I have attached a video that shows how to do this. If the connector on your vehicle is not functioning as it should, then the problem could be related to a poor connection or faulty wiring on your vehicle. If this is the case, you can send me the year, make, and model of your vehicle and the problems you found during testing, and I would be happy to come up with a solution for you.

First, inspect the connectors on the trailer and the vehicle for corrosion and repair or replace as necessary. Next, check the ground connections on the trailer. A poor ground could cause the lights to malfunction. Be sure to check the main trailer ground and the grounds for each light assembly if they are accessible. If possible, it is best to route all of the ground wires back to the main trailer ground, but this may be difficult if the wires are hidden behind wall panels on your camper. If the wires are not accessible and you aren't comfortable removing wall panels, I recommend taking your trailer to a trailer shop.

If all of the ground connections are good and you do not see any corrosion, inspect the wiring for any potential shorts that could cause power to jump between the tail light wires. Follow the wires from the trailer connector all the way back to the tail lights looking for any pinched, frayed or damages sections of wire and repair or replace and needed.

I have attached a link to our trailer wiring help article that gives general trailer wiring information and troubleshooting.

expert reply by: John H

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Answer 1

The most likely cause for the incorrect behavior of your trailer lights, where activating one turn signal causes all trailer lights to blink, is an insufficient ground (or a short to ground) on either the vehicle or the trailer. Since you re-wired…

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Answer 2

It sounds like you might be getting some bleed-over from the turn signals occurring in the trailer connector. Take a look at the trailer connector, and check the plug for corrosion in the sockets. If you see any green or white corrosion in the…

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Answer 3

What you are describing is normally the result one 1 of 3 issues: First, there could be some corrosion in or on the connectors on the vehicle or trailer side or both. Second there could be a bad ground. Bad grounds can cause all sorts of bizarre…

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Answer 4

If both turn signals blinking at the same time is a new problem that has occurred after the harness had worked fine before, there are a couple of possibilities that may be causing the issue. First, the easiest thing to check are the trailer…

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Answer 5

Going by the colors that you mentioned, it sounds like you have the typical set-up, green wire for right turn and brake, white wire for ground, yellow wire for left turn and brake, brown with green wire for right side running lights, and brown with…

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Answer 6

We do have the white Replacement Exterior Half-Moon Trailer Vent for 3" Diameter Hole #WHMAV2 which is the white version of the #HMAV2 that you referenced and also is what you sent in a picture of so it would work well for you.

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Answer 7

The Dexter Dual Trailer Wheel Lug Nut with Swivel-Flange part #6-118 will require a 32mm socket which is roughly the same size as a 1-1/4 socket.

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Answer 8

Your 4-pin/5-wire wiring harness is what is called a "wishbone" type which simply means that there are two separate running light wires, one brown and one pink. This allows a separate running light wire for each side of the trailer which…

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Answer 9

I have a solution for you to hook up the Optronics LED Trailer License Plate Light w/ Bracket #LPL55CB to your 2021 Subaru Ascent without tapping into the wiring. You could install Hopkins Endurance Easy-Pull Harness w/ 4-Pole Flat Connector -…

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Answer 10

For a single axle trailer, you want the shackle strap to be able to move so that you have the spring deflection needed for your suspension. Angled like the photo or even almost vertical is fine you just don't want the shackle strap to bind and…

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Answer 11

You will want to use the 1-1/2" Long Torx Floor Screws #TF01150 to hold your 5/8" marine treated plywood on your snowmobile trailer. These screws are the same 1/4" diameter you removed from your previous flooring. They are 1-1/2"…

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Answer 12

The Dexter Trailer Axle Beam with E-Z Lube Spindles - 89" Long - 6,000 lbs #8327830 comes with the spring seats (perches) welded in place and they cannot be ordered without them attached. However, you can add spring seats if you need them in a…

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All Trailer Lights Flash When Using Turn Signals and Running Lights

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