Q: I changed starter alternator and battery but after 2 weeks i came outside and i needed a boost.

asked by on

Two weeks ago I changed my starter battery and alternator I came outside to crank my car today and my battery was dead I had to get a boost what else could it be if I have changed everything and they're all brand new

My car has 220112 miles.
My car has an automatic transmission.

You may have a failing voltage regulator that could be allowing the alternator to supply too much or too little amperage to the battery resulting in the battery never maintaining a consistent charge as it is designed to. 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. A common sign of this is usually the acid inside the battery boiling causing the battery to swell. You may also smell a bit of smoke due to things potentially getting too hot. 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?
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. I changed starter alternator and battery but after 2 weeks i came outside and i needed a boost.

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: All the gauges are moving at the same time when i drive

Check the cluster fuse and all the instrument cluster wiring connectors and grounds. Unplug the connectors and plug them back in. Also, check the grounds behind and under the cluster for proper tightness. If they're all good, the instrument...

Q: Belt squeaking when I drive. How do I get it to stop?

The problem with most belt dressings is they work by causing a softening of the rubber compound the belt is made of, which although may be convenient to quickly stop a squeaking noise, in the long run is not a...

Q: Q: Engine idle fluctuates

It sounds like you may have a dirty or failing idle air control valve. The idle air control valve monitors the air intake as it is mixed with fuel prior to being injected into the engine at low speeds and...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...
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.