Why does my trailer running light 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).
Why won’t my trailer tail lights work?
Many trailer problems are due to a poor grounding connection, which is usually the white wire coming out of the trailer plug. If the ground is poor, lights may work intermittently or not at all. Even if the wiring to the plug is adequate, make sure that the ground connections to the trailer frame are good.
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?
What to do if your running light fuse keeps blowing?
Replace the fuse and then use a circuit tester such as # PTW2992 to test the vehicle side trailer connector while someone sits in the vehicle and turns on the running lights. If it shows power and the fuse does not blow then the issue is on the trailer. If it does blow the fuse then the issue is on the vehicle.
How does a tow truck trailer light work?
Vehicles that have towing capabilities use a separate wiring system to power trailer lights, which are protected by additional fuses located in power distribution center. The rear license plate bulb is also illuminated when the running lights are on.
How can I tell if my tail lights have a fuse?
When you have located the fuse for the tail lights use a fuse tester to check the connection. If the tester lights up – your fuse is functioning fine. If it does not light up then, replace the fuse with another of the similar amperage and size. In many instances, you can see the break in the metal strip of the fuse.