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: Steering shaft problem - 1996 Chevrolet K1500

Hi and thanks for contacting YourMechanic. Either you have gotten a steering column for a different year or model of Chevrolet truck, or the steering column was modified for another vehicle. You can change the shaft to match the vehicle...

Q: What are the things that I should watch out for when buying a 2003 bmw 745li? I want to make sure I don't buy a clunker.

Let me answer your last question first regarding ultimate longevity. So long as the vehicle does not have, or does not develop, extensive (frame damaging) rust the vehicle will last forever, simply because any and all mechanical components on any...

Q: The truck is riding hard

When you say the truck is riding hard, I have seen many of the suspension struts binding causing a hard ride. They do not shift to smooth ride and may stay stiff. Replacing the shock/struts fixed the issue with ride....

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.