An engine that quits on the road while the dash lights up is often running on battery alone. We find out why and replace the alternator where the car ends up.

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Call hours: Mon to Fri 7:00 AM to 8:00 PM · Sat 9:00 AM to 4:00 PM

Alternator and starter in Roanoke

Why a bad alternator can stall a running engine

Once the engine is running, the alternator is supposed to power everything: ignition, fuel pump, computers, lights and fans. The battery is mainly there to start the car. When the alternator stops charging, the car keeps going on whatever the battery has left.

That reserve does not last. As voltage drops you may see flickering gauges, a battery light, a radio that cuts out or power windows that slow down. Then the engine stumbles and shuts off, often at a stop when the idle is low. After that it usually will not restart, and that makes it look like a starter problem. We separate the two with a few tests at the car.

Quick facts

Where

Your home, work or roadside in Roanoke

Price

Given before any work starts

Call hours

Mon to Fri 7:00 AM to 8:00 PM · Sat 9:00 AM to 4:00 PM

Reach us

Call or text 817-709-1357

Warning signs

Warning signs before the engine quits

Battery light on while driving

The alternator has stopped keeping up and the battery is draining.

Gauges jumping or dropping to zero

Low system voltage confuses the instrument cluster.

Wipers, blower or windows slowing down

There is less voltage available for every accessory.

Stalling at stoplights

Low idle speed plus falling voltage is often the point where it shuts off.

Burning rubber or hot wire smell

A seized alternator pulley or overheating alternator can cause 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

Getting the car looked at where it stopped

If the car quit on the roadside and is parked safely, call or text and tell us where it is. If it limped home, we can come to the driveway instead. We check battery charge, alternator output, the belt that drives it and the main wiring, and confirm whether the starter is fine.

You hear the cause and the price before work begins. When it is the alternator, we usually replace it right where the car sits, then test charging again before we leave. If the job needs more time than a roadside visit allows, we schedule it at your home or work.

Questions

Alternator and starter questions from Roanoke.

Can a bad alternator make my car shut off while driving?

Yes. The engine needs steady voltage for ignition and fuel delivery. When the alternator stops charging, the battery carries the load until it runs low, and then the engine shuts off. We can test the charging system where your car is parked in Roanoke. Call or text to get on the schedule.

My car died and now will not crank. Is that the starter?

Maybe, maybe not. If the alternator quit first, the battery is probably too drained to crank the engine, and a good starter will just click or do nothing. We charge and test the battery, then check the starter and alternator separately. Text us what happened right before it died.

Can you come to the side of the road?

Yes, as long as the car is somewhere safe for us to work on it. Roadside and onsite repair is part of what we do. If the spot is too tight or too close to moving cars, we will talk through other options with you. Call or text with the location.

Will my car restart after it stalls from a dead alternator?

Sometimes. After sitting, the battery may recover enough for one more start, but it will drain again within a short distance. Driving it that way risks stalling somewhere worse than where it is now. Leave it parked and call or text so we can test it where it stopped.

Around Roanoke

What to do if the engine shuts off on the road

If the gauges start acting up, turn off the AC, radio and anything else you can, and head for a safe place to stop. If the engine has already died, get the car out of the lane if you can, turn on the hazards and stay clear of moving cars. Then call or text and tell us where the car is and what the dash showed before it quit.