What would cause trailer lights not to 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.
What is a DRL fuse for?
The only thing that fuse affects is your Daytime Running Lights. The head lights come on for a short period of time and there is nothing you can or should do about it. In many states, it is illegal for newer model vehicles to operate without some type of lights in the daytime, so check with your DMV first.
What to do when your running light is not working?
If no power is confirmed, repair the fuse holder or the power feed (maxifuse – fusible) from the fuse panel to the switch. If power is confirmed at the rear of the switch, turn the switch to the “ON” position and test the remaining terminals (or wires), power should be present at the remaining terminals. Learn More
How to troubleshoot no running lights on trailer but turn?
Testing the truck’s connector tells if the problem is on it or the trailer. If everythig checks out here then the issue is on the trailer side. If you have a problem on the truck then you need to trace the wires coming from the connector looking for any damage. You should also check the ground connection making sure it’s clean and solid.
What happens when a running light switch fails?
The headlight/running light switch is used as the trigger circuit which sends a signal to activate the relay. When this relay fails, it will hinder the operation of the running lights. Learn More
What does no power at connection terminal mean?
No power at the connection terminal indicates a break in the wire. Power at the connection terminal but not at the receptacle plug indicates a faulty receptacle. Switch the main circuit breaker to the Off position. Disconnect the wire from the circuit breaker and the receptacle.