Skip the auto shop - Our mechanics make house calls

Q: Headlights stay on permanently

asked by on

My headlights stay on permanently, and a number of interior power outlets are not working.

A: It sounds like you may have an electrical s...

It sounds like you may have an electrical short somewhere in your lighting system. The short is most likely a short-to-power rather than a short-to-ground. The two circuits may have collided at some point within your wiring system. If the power outlets do not work, it is possible that the power that would normally be sent to the outlet is now being used to power the headlights constantly. Power outlets have a constant twelve volts whereas headlights only receive twelve volts when they are turned on. Unfortunately, the only way to really check this is to have a wiring diagram. Once a diagram has been obtained, have a certified technician inspect your electrical system using this information. Most likely the technician will need to trace wires in order to locate the issue for your headlights.

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: Lighting bolt came on after changing out alternator, what may that mean?

Although the two alternators may look the same and fit the same your vehicle was equipped with the less amperage alternator. The alternator is controlled by the computer and may not charge correctly if the wrong one. Have the system...

Q: Car losing oil, excessive transfer case fluid

Hello. These two systems are separate so they would not be related. If the transfer case is overfilled then it was either filled too high when it was last serviced or water got into it if you have driven through...

Q: Electrical problems with keyless entry, headlights and radio

Hello. We will be happy to assist. The problem you are experiencing is common. The symptoms you have are identical to many other SL500 owner complaints. The component which causes all the misbehavior is the EIS (Electronic Ignition Switch). Symptoms...

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...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.