Q: Replacement alternators don't work, not a battery issue

asked by on

We own a 2001 Honda Accord and it has been having alternator problems. We have replaced the alternator multiple times in the past year. At first, I thought that the refurbished one that I had bought was defective, so then I went to the dealership and bought a brand new one. The new one still went out, and I even replaced the battery and posts. No one can figure this out. Please help!

Sorry to hear about your repeated alternator failures. Indeed poor quality parts can often be the cause of repeat failures, though there are other potential causes which are often overlooked. In the case of alternator failure, you already tried to address one of the concerns, which is the battery. Even though it is brand new, it should still be thoroughly tested. Batteries often sit on the shelf for a long time before being sold, and this can take a toll on them and their ability to properly take a charge. The other commonly overlooked issue is the charging system cables and connections. A poor connection or high resistance in a cable can cause the alternator to work at full capacity all the time, leading to a premature failure. Voltage drop tests should be performed across all the cables and connections in the charging system. If you’re not up to this task or don’t have the correct tools, a professional, such as one available from YourMechanic, will be able to perform these these tests for you.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1,000 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. Replacement alternators don't work, not a battery issue

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: Replaced alternator but still not sending power to the battery.

Hello. If your engine is able to crank all the time and will not just start, the issue is not in the battery or the alternator. A good battery charge is required in order to even get the starter to...

Q: Sluggish start. Bad starter or bad battery? Female. Don't want to get taken by shop.

Hi! That "sluggish starting" (slow cranking speed) is the most common symptom when a battery is at the end of its life. The age of your car is also just about in the normal range for how long batteries last....

Q: Whining noise when accelerate and then let go of pedal

The whining is in the CVT transmission and depending on the noise, it may be a normal noise from the transmission. The noise is the transmission CVT belt changing pitch as you drive faster. Sometime the noise will get...

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...
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...
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...