All Trailer Lights Blink When One Turn Signal Is Activated
Question:
i have put knew male and female plugs on my boat trailer and you put the right or left bliker on with lights they all blike do i need a earth some were
asked by: Dave
Helpful Expert Reply:
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 your trailer, you can check for a secure ground connection at the trailer connector. Make sure the white ground wire is firmly secured to a clean bare-metal surface that is free of paint, rust and grease. Next check that the ground wire for the vehicle's wiring harness also is secured to the vehicle at a clean bare-metal surface that is free of paint, rust and grease.
If your vehicle's trailer wiring harness is a hard-wired type (not a quick-connect pre-wired plug-and-play type) then you need to check that the brake light wire on the harness is grounded.
I have linked an article on troubleshooting that will give you additional information. If you happen to have access to a different tow vehicle and/or trailer, you can try substituting one or both to see if the problem can be isolated to either the vehicle or trailer. If you have a circuit tester like # PTW2993 you can disconnect the trailer and test the pins on your vehicle's connector for correct operation.
Karl P.
5/26/2020
Hello, I have a vermeer trailer the is having lighting bleed back. What I mean is that when the left turn signal is on the lights are bright but the right side blinks very dim. And the same goes for when the right signal is on it is bright and the left blinks dim. I thought is was a grounding issue but this hasn't seem to fix the problem. Any thoughts? Thanks for your help.
Chris R.
5/29/2020
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Combination LED Trailer Tail Light - Submersible - 6 Function - 11 Diodes - Passenger Side
- Trailer Lights
- Tail Lights
- Rear Reflector
- Side Marker
- Side Reflector
- Stop/Turn/Tail
- Square
- Surface Mount
- Submersible Lights
- LED Light
- 5L x 5W Inch
- Red
- Optronics
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Greg
7/28/2020
I'm having a similar issue to the original questioner: The brake and running lights will start flashing when the turn signals/hazards are activated. The trailer lighting works fine with other vehicles so I'm certain the problem is in my truck. I've replaced the trailer harness and this still doesn't rectify the problem. The truck's lights all seem to work fine but perhaps there's a small short somewhere that's dropping voltage to the trailer? Seems like some of the lights have a bit of play and corrosion in the fixtures. I don't know how to check the voltage on the turn signal wires as I have a cheap multimeter and the voltage is constantly changing (with the flashing). All the other wires on the harness (tail, brake) read the same approximate voltage as the battery when using the trailer harness ground, so does this suggest the ground is fine? "If your vehicle's trailer wiring harness is a hard-wired type (not a quick-connect pre-wired plug-and-play type) then you need to check that the brake light wire on the harness is grounded." What do you mean by this? Any feedback would we so greatly appreciated as I've been struggling with this for ages now! Cheers!