When a fresh battery goes flat within days or weeks, the battery is rarely the real problem. We test what charges it and what drains it, then fix the cause at your car.

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Alternator and starter in Watauga

A new battery that dies again points somewhere else

You replaced the battery, the car started fine for a while, and now it is dead again. That is annoying, and it is also useful information. A healthy new battery that keeps going flat is usually being let down by something around it.

The most common cause is an alternator that has stopped charging properly. The engine runs off the battery until it is drained, and the next start fails. Other culprits include a loose or corroded cable, a slipping belt, or a module or light that stays on after the car is shut off. We test charging output, the connections and the key-off draw so the next battery does not meet the same end.

How it works

Call or text

Tell us the year, make and model and what the vehicle is doing.

Get a price

You hear the price before any work starts.

We come to you

The repair happens where the vehicle is parked. Bigger jobs get scheduled.

Warning signs

Clues that the alternator is behind the dead battery

Dead again within a week of a new battery

The charging system or a key-off drain is the likely cause.

Starts with a jump and dies soon after

The alternator may not be producing any charge.

Headlights brighter when you rev the engine

Output may be falling off at idle.

Battery light that comes and goes

The charging voltage is dropping in and out of range.

Warm or swollen battery case

An alternator that overcharges can cook a battery as surely as undercharging drains it.

Engine work in progress under the hood of a truck

Why Day's

Shop-level work, where you park.

We bring dealer-level diagnostic tools, including a lab scope and a thermal camera, to wherever your vehicle is parked.

Fords are our specialty, built on years of maintaining a construction company's fleet, from cars and light trucks to heavy-duty work trucks.

About Day's

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How it works

Testing the system before replacing anything else

Start with a call or text. Let us know when the battery was replaced and how long it lasted before dying. We come to wherever the car is parked and check the battery first to confirm it is good, then measure alternator output with the engine running and loads switched on.

If the charging side checks out, we look for a draw with the key off. Once the cause is clear, you get a price before any work starts. An alternator swap is usually done right there in the driveway. Chasing a hidden draw can take longer, and if it does, we schedule a time for it.

Questions

Alternator and starter questions from Watauga.

Why did my new battery die after two weeks?

Usually because nothing is recharging it, or something is draining it while the car sits. A weak alternator, a slipping belt, a bad cable or a light that stays on can all do it. We test each one at your car in Watauga. Call or text and tell us when the battery went in.

Could the new battery itself be bad?

It happens, though less often than people expect. We test the battery before we blame anything else for that reason. If it fails the test, we tell you, and you can take it back where you bought it. If it passes, the search moves to charging and drain. Text us to set up a test.

How do you check for something draining the battery?

With the car off and everything closed up, we measure how much current is still flowing out of the battery. A normal car draws very little once its modules go to sleep. If the number stays high, we narrow it down circuit by circuit. Call or text when you want that test done.

Should I buy another battery if this one dies again?

Hold off until the system is tested. A second battery on a car with a charging problem or a drain will go the same way, and every deep discharge shortens its life. We find out what is pulling it down first. Call or text to set up the test.

Around Watauga

What to do before the next dead start

Call as soon as a new battery fails a second time. Keeping it alive with jump starts or a charger hides the cause and wears the battery out early. If you can, have the date of purchase handy, and note how long the car sat before it would not start. A car with a charging problem should only make short trips until it is checked.