Skip the auto shop - Our mechanics make house calls

Q: Battery light and air bag light comes on and off

asked by on

Hi I currently have a 2003 ford zetec , driving home my battery light and air bag light came on, they both go out after a few seconds, but tonight all my instruments failed for a few seconds before starting back up again , my alternator seems to be charging the battery but it's charging to high, car starts up first time all the time, this is my first car so I don't really know much about them . Thanks for the help

My car has 12000 miles.
My car has a manual transmission.

This may be a voltage regulator issue. The voltage regulator is a unit that regulates the charging of the battery by the alternator. When the voltage regulator is not working properly, this may result in the alternator allowing too much power to be delivered to the battery resulting in damaging wires and prematurely sometimes destroying the battery. In other cases it may result in the alternator not supplying enough power to the battery, resulting in undercharging the battery or not charging it at all. I would recommend having an expert from YourMechanic come to your location to diagnose your vehicle’s charging system.

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
  1. Home
  2. Questions
  3. Battery light and air bag light comes on and off

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: Charging system warning light.

Hello There, What you are describing sounds like you may have a failing alternator. As you may know, the alternator is responsible for charging the battery while the engine runs by generating amperage and recharging the battery while the engine...

Q: I got my car inspected it failed they gave me a price i want to make sure its not over priced

You would need to give more detail of what work would be performed and parts provided for the $1500. You also did not state what was the cause of the vehicle failing the car inspection. If you supply this information...

Q: Vehicle hesitation at 40ish mph, existing exhaust issues, related?

Hi There, What you are describing sounds like you may have a clogged or damaged catalytic converter. The catalytic converter converts toxic exhaust gases into less harmful pollutants that are suitable to be expelled into the atmosphere. When the catalytic...

Related articles

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...
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...