Skip the auto shop - Our mechanics make house calls

Q: Car won't start, would not start with boost. Ran fine when I bought it. It sat for two weeks and the alarm was left on.

asked by on

Just bought my Mazda off girl in to. Drove home to Cambridge and parked it. It sat for two weeks with alarm left on. Went to start it up it was dead. Gave it a boost and it didn't start. Nothing comes on. Could my alarm made the battery dead?

A: Hello. The short answer is yes - the alarm ...

Hello. The short answer is yes - the alarm can drain the battery in 2 weeks. It is also possible that something else is draining the battery while the car is turned off, and all electrical systems should be passive. This problem can be diagnosed by connecting an ammeter to the positive (red) battery cable, observe the current drain, then one at a time, remove each fuse. Check to see if the current drain has dropped to near 0, then reinsert the fuse. This process should identify the faulty circuit in most cases. Further diagnosis is then required for the electrical components on that fuse to identify the component pulling current. A professional mechanic, like one from YourMechanic, can diagnose the starting problem and perform any procedures or repairs needed to have this resolved.

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・Save up to 30%

Get a quote

What others are asking

Q: Reset after battery replacement

Hi. This is a common problem for the Vues and typically is just a fuse that has gone bad. There is a service bulletin for the 15A Audio fuse in the center console fuse block that other owners have replaced...

Q: Upon locking the door and exiting the car. The alarm started screaming and I cant turn it off. What can I do?

Hi there. It sounds like the "panic" function of the key fob is stuck. Remove the key battery and inspect the function of the panic button. If it is not operating correctly, then replace the key fob case if available...

Q: New alternator and battery. Volt gauge is reading less than 12 volts.

Hello there, a few common failures can prevent your 1984 Volkswagen Rabbit from charging even after the battery and alternator have been replaced. The most common would be the battery cable, a faulty voltage regulator, a bad alternator fuse, or...

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.