Why wont my running lights work on my truck?

Asked By: Wilhelmina Gotschlich | Last Updated: 8th April, 2020
Category: automotive motorcycles
4.5/5 (79 Views . 13 Votes)
If there is no power on the running light pin then there is a break or loose connection somewhere between the connector and where it terminates at the front of the vehicle that you will need to track down. Running jumper wires from the light grounds to the main trailer connector ground can help.

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Likewise, people ask, why are my running lights not working?

Common causes for this condition is a loose fitting bulb inside the socket. To test for this condition expose the tail light bulb in question. If the complete system flickers (all bulbs flicker) wiggle the tail light fuse, relay and associated wiring at the headlight/tail light switch.

Also Know, is there a separate fuse for trailer lights? Yes, trailer wiring harness #118269 does have a fuse in a black holder just below the large black converter box. If that fuse is fine then use the vehicle owners manual to find any fuses related to tow package wiring on the vehicle to check them.

Thereof, why are my running lights not working on my trailer?

A bad or missing trailer ground is a VERY COMMON reason that lights don't work on a trailer, or they only work sometimes. A pin on the truck socket and a pin on the trailer plug are dedicated for this ground connection, so test that connection FIRST when troubleshooting a problem.

Is there a fuse for tail lights?

A blown fuse usually causes both lights to go out. On newer cars, the tail lamps can be fused separately and/or each bulb or shared circuit can be fused. A fuse can be blown due to other problems, so you'll need to check more than just the fuse, but it's the right place to start.

39 Related Question Answers Found

Do tail lights and brake lights use the same bulb?

Tail light and brake light are the same bulb. Tail light works, brake light doesn't.

What is a tail fuse?

#1 – Bad Tail Light Fuse
The first thing to check when facing an inoperational electrical component, especially when it comes to bad tail lights, is the fuse. A fuse is basically a metal band inside a plastic container designed to break when the current flowing through it becomes too high.

Why do I have brake lights but no tail lights?

Blown out light bulbs are the most common reason for why the brake lights not working but the tail lights are. Remove the screws from the bulb lens (which you can access through the trunk or see your vehicle repair manual to get the exact location). Choose the new bulbs of the same type and wattage.

Where is the brake light fuse located?

Like all fuses, the brake light system fuse can be found in the power distribution center, which is under the dashboard or tucked away underneath the hood.

How do you fix a bad ground wire on a brake light?


How to Fix a Bad Ground Wire for Brake Lights
  1. Locate the ground connection for the brake and tail lights.
  2. Remove the screw holding the ground connector to the car body.
  3. Using sandpaper, remove any rust from the connector and the contact area on the car body.
  4. Reattach the ground connector to the body.

Can daytime running lights be turned off?

Please remember, daytime running lights (DRL) are a safety feature that can help make it easier for others to see the front of your vehicle during the day. If your vehicle is equipped with a "DRL OFF" setting, they can be turned off by twisting the headlight control knob to "DRL OFF."

Is there a fuse for trailer brakes?

If the trailer brakes will operate with the manual switch, but not when the truck brakes are applied, check the CHMSL fuse in the fuse box under the hood. The lid to the fuse box will have a legend that will help you locate the fuse.

Will trailer lights work without a ground?

Expert Reply: In some cases trailer lighting will ground through the hitch ball but that's typically only if the actual ground circuit is insufficient. It needs to ground through the wiring of the trailer harness.

What color is the ground wire on a trailer?

Brown wire to the tail or parking lights. Green wire to right turn signal/brake light. Yellow wire to the left turn signal/brake light. White wire to common or chassis ground.

What is the brown wire on trailer lights?


Normally, the green wire on the right side carries right turn signal and brake light functions and the brown wire carries running light functions. On the left side, the yellow wire carries left turn and brake lights and the brown wire again carries the running lights.

Is there a fuse for daytime running lights?

Remove the cover from the fuse box located in the engine compartment. Locate the "DRL" or "Daytime Running Lamp" fuse. If you are unsure of the fuse location, consult your vehicle's owner's manual. Remove the "DRL" fuse from the fuse box and replace it with a new fuse.

Where is the daytime running light module located?

Typically, the daytime running light module is located under the dash or in the engine compartment. The exact location can be found in the vehicle repair manual.

How do I reset my daytime running lights?

How to Turn Off Daytime Running Lights
  1. Press your parking brake slightly until it clicks once.
  2. Locate the power distribution box in your vehicle.
  3. Remove the "DRL" fuse from the power distribution box.
  4. Consult the manual for your vehicle because there are different procedures for each one.
  5. Cut the negative or ground wire that leads to the bulbs for the DRLs.

How do you check a tail light with a multimeter?

Touch the black probe for the multimeter to the metal case of the tail light. The black probe is for connecting to the ground. Press the red probe for the multimeter against the electrical connections inside the light bulb socket. If the vehicle is a 12-volt system, the multimeter should register 12 volts.

Why did my DRL light come on?


Usually, if the DRL light is on, it indicates that the computer has detected an issue. This light should turn off afterwards once the system verifies that everything is working as intended. Typically, a faulty bulb may be the culprit, but there are fuses and relays in the circuit that can cause similar issues.

Can you get a ticket for tail light out?

Yes, police can legally pull you over and issue a ticket for having a broken tail light. The wording on the citation will be either "no tail light" or "broken tail light." You're lucky the police officer just issued a warning Thank you for your response.

Why are my LED tail lights not working?

Tail and Turn Signal Light LED Bulb Fix
Or, do your tail lights not work correctly? The reason for this is your cars computer thinks your bulb in burnt out. LEDs don't use much power and don't put a the current draw (LOW resistance) needed across the terminals of your tail, signal, or break light.