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Inactive, Master Electrician
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Experience:  Electrical Contractor
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Why do both of my trailer lights flash when my turn signal ...

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Why do both of my trailer lights flash when my turn signal on my truck is only using the left or right light?

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You are corresponding with Joseph - Your personal On-Line “Electrical Consultant”

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The reason for this is because you have lost your ground or have a poor grounding connection. You will need to check the ground wire on your trailer wiring to ensure its solidly connected. Additionally – double check and make sure your trailer lights themselves are solidly grounded to the chasis of the trailer.

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Customer: replied 8 years ago.
Thanks, XXXXX XXXXX tried various combinations of grounding. None of which have worked. If I'm to be completely honest, I personally think the way these trailer light kits are wired is a joke.

I should mention that when I apply the brakes or turn on the headlights they do what they are supposed to. Just whenever a turn signal is asked of them they respond with emergency flashing.

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Personally what I would do is run an independent ground wire from the chasis of the vehicle to the ground wire and chasis of the trailer itself to test what I have said here. If it cures your problem – then you just need to make the connection permanent.

Hope this helps you out. If you should need anything further please don't hesitate to ask. Good Luck!!

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