Q: Charging System Failure and Battery Light on

asked by on

I was trying to jump start my 05 Buick Terraza V6 .5L automatic front wheel drive van and i didnt know that the jump start assist thats connected to the fuse box was suppost a positive terminal and i was trying to connect the negative cable to it, and it shot my starter. So i changed it and a couple of days later the "Charging System Failure" appeared on the dashboard. I changed the Alternator and Battery, but it is still not charging the battery. I changed the alternator and battery multiple times and still "charging system failure" appears. I checked all the fuses under the hood and the fuses on passenger side and all are in good condition. what could be the problem?

My car has 180000 miles.
My car has an automatic transmission.

Hi There, It sounds like you may have a voltage regulator issue that might not be allowing the alternator to charge the battery sufficiently. The voltage regulator 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?

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. Charging System Failure and Battery Light on

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: spark plugs and cables

Normally, vehicles this new do not require gapping the spark plugs as they should come pregapped. When you have spark plugs with precious metals such as platinum, double platinum, or iridium, these types of plugs should not be gapped. This...

Q: Why won't my van crank?

Look at your dash when you turn on the key to see if the theft light is on. If it is, then you have a problem where the theft system is not deactivating. Try to get out and lock all...

Q: Wondering about gasket or manifold issues

This engine is well known for having intake gasket leaks, so I'm fairly confident the gasket is the problem. With this engine, the first sign of a failed lower intake gasket is oil/coolant intermix. There is an upgraded gasket available...

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...
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...