Skip the auto shop - Our mechanics make house calls

Q: Truck lights not working

asked by on

The truck lights aren't working. It's not the bulbs, but it could be in the steering column.

If the bulbs are good, the problem could be with the power circuit. The circuit involves the fuse, a relay and the switch. Any of those components will keep the lights from working. Electrical issues can be troublesome to diagnose. If the fuse is blown, that usually means a short to ground. Shorts are when a wire that has battery voltage touches ground. When this happens, the fuse is blown so the wire does not melt. A relay is a sort of like an electrical bridge that delivers power to the lights when you turn the switch on. These can go bad. Relays require the use of a volt meter and a power probe to check. The switch is the last thing. It is what usually fails besides bulbs because it is used every time we drive in the evening. Sometimes if the switch is bad, the dash lights or interior lights will not work either. Some specialty tools and wiring schematics may be required for the diagnosis. I recommend having a qualified mechanic, such as one from YourMechanic, help you diagnose your lights issue and have the appropriate repairs made.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Battery charger makes loud noise when trying to charge battery?

Hi There, Most battery chargers on the market today have a couple of different settings. They will usually have a regular 12 amp charging mode, a 6 amp charging mode and a boost charging mode. The 6 and 12 amp...

Q: 05 ram 4x4 Vibration in the floor during acceleration, and a vibration in​ steering at cruising speed that goes away when letting off the gas.

Hi there. This sounds like the tires on the front are out of balance and the ball joints are worn and need replaced. A out of balance wheel will cause the vehicle to vibrate and may change location to the...

Q: I recently bought a 2003 Kia spectra with 144k miles on it. It ran fine till one day I started and the check engine light came on

Let me go last to first. If the timing belt has never been replaced, it's been on borrowed time for a long while now and should be replaced as soon as possible. Internal engine damage is very likely if the...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...