Why does my trailer running lights fuse keep blowing?
You have a short circuit somewhere that is causing the fuse to blow. Likely causes of a short on a vehicle include a dirty or corroded trailer connector or damaged wiring. Make sure the trailer connector is clean (go ahead and do the same for the trailer side connector while you’re at it).
How do you check for a short in trailer wiring?
Use an ohm meter, and check all the wiring for continuity to ground. If your running lights are blowing the fuse, and the brake & turn signals work fine… your brown trailer wire is shorted to ground somewhere, or you have a grounded running light on the trailer somewhere.
What are the running lights on a trailer?
The next thing is to make sure the wires on the trailer plug is wired properly to the trailer. If you have a 4-Way connector on the trailer the white wire is for ground, the green wire for right turn and brake, yellow wire for left turn and brake, and the brown wire is for running lights. I am including a link to a FAQ page on trailer wiring.
How to troubleshoot a trailer blowing the running?
If you have a boat trailer with the wiring inside the frame you will need to pull it out to check it. Attach a string so the wires can be pulled back through the frame when done. If that does not work, you may have a bad light on the trailer. Remove each light one at a time until you find the one that solves the issue and replace it.
What should I do if my trailer lights are not working?
Open them up and make sure there is no white or green corrosion causing an issue inside the connectors. If so clean them out or replace the connectors with new ones. If the problem is not found in the connectors, you will need to follow the trailer wiring and check all of the grounds for all of the lights and the trailer connector.
How do you find a trailer light short?
Looks like Bassn is a faster typer! Well if brake and turn signal work then those wires ( green and yellow) seem ok and it would be the brown color common tail light wire that is bad. You can use a battery charger to check lights. Apply power to each individual lug on the connector and see what happens.
The next thing is to make sure the wires on the trailer plug is wired properly to the trailer. If you have a 4-Way connector on the trailer the white wire is for ground, the green wire for right turn and brake, yellow wire for left turn and brake, and the brown wire is for running lights. I am including a link to a FAQ page on trailer wiring.
Why do trailer lights keep blowing trucks fuse?
There is a 20 amp fuse in the passenger kick panel that controls the trailer’s running lights (brake lights and turns are another circuit) that keeps blowing. Interestingly we also have an 2001 Expedition with factory tow package that doesn’t have this problem. Truck is like new (24k miles) and just developed this issue. Any ideas?
Why is there no ground wire in my Trailer light?
If there is not a white ground wire coming out of a trailer light, then the light is grounded through its mounting studs. Too much paint, dirt, or rust can cause bad grounds, so make sure the ground is secured to the bare metal frame.
Looks like Bassn is a faster typer! Well if brake and turn signal work then those wires ( green and yellow) seem ok and it would be the brown color common tail light wire that is bad. You can use a battery charger to check lights. Apply power to each individual lug on the connector and see what happens.
