Q: Put new battery in my car

asked by on August 30, 2017

I replaced my battery seeing as my car wasn't starting and it would only start with a jump. Two days after while driving I lost all power. So, I got a new alternator, when I went to take the old one out there was corrosion on the screw and the terminal from the wire from the battery that connects to the alternator. When I went to unhook it the screw was attached to the terminal. What caused to have corrosion to be on the screw and terminal? I've never experienced that before. I cleaned everything up and put the new one on. Went to start and got nothing. Recharged the battery, it started right up but only last 3 hours of drive time before completely dying. Any ideas on what I need to do next?

My car has 144000 miles.
My car has an automatic transmission.

Hi Tiffany. Thanks for writing in to YourMechanic.com today. Corrosion is caused by oxidation, and battery acid leaking - which occurs overtime. It can create a faulty ground or power connection and cause several of the symptoms you are describing. If you’ve replaced the alternator, and the battery recently, then my guess would be that you have either a few faulty relays - or the wiring within the charging system is worn out and should be replaced. To be honest, there are about a dozen other possibilities that should be inspected, so you might want to have a professional mechanic complete an electrical inspection to isolate the source of this issue.

Was this answer helpful?

The corrosion at the wire from the battery can be caused by the battery leaked acid into the battery cable and it will travel all the way through the wire inside the plastic cover and get all the way into the cable ends and cause loss of connection. You will need to inspect and test cable and if corrosion is all through the cable then replace it.

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

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

No more engine oil 2005 Ford Mustang

Hello - If you have lost all the engine oil through the oil pan, there is no doubt broken internal engine damage. Most likely, this is a broken connecting rod or piston. Attempting to restart the engine would be difficult...

Problems with glove compartment.

Sometimes if too many items were stored in the glovebox before it was closed last something could be jammed in between the latch mechanism. It is also possible that the glovebox was locked and the lock was broken in the...

My car has been making a rattle noise.

The heat shield is designed to keep the engine at a specific temperature. I recommend leaving the heat shield on but fixing it to where it does not vibrate. Look for any cracks or broken bolts to see if the...

Related articles

Mercury Certified Pre-Owned (CPO) Car Program
Drivers Drivers who are shopping around for a used Mercury vehicle may want to check out cars under their certified pre-owned program. Many manufacturers have a certified pre-owned (CPO) program, and each one is set up differently. Read on to...
How Long Do Wiring Harnesses Last?
Car wiring harnesses connect all the different electrical systems and components in a vehicle. Wiring harnesses can last the lifetime of the vehicle.
How Can the Light Bulb Wiring Become Damaged?
Your Your car is as much electrical as it is mechanical. Wiring harnesses snake their way around the engine bay, and throughout the cabin of the vehicle. Most of your accessories run on electricity, and even the engine needs a...