Alternator testing & replacement.
Expert alternator service: keep your vehicle's electrical system running strong.
Don't let a failing alternator leave you stranded. Our certified technicians specialize in diagnosing and replacing faulty alternators, ensuring your vehicle's battery stays charged and electrical components function properly. Using only high-quality OEM and aftermarket parts, we provide quick, reliable alternator replacement at competitive prices. Schedule your service today and restore your vehicle's charging system to peak performance.
// Certified technicians · OE-quality parts · 24mo / 24,000-mile warranty · we come to you
Typical cost
Cost varies with the make and model of the vehicle, the type of alternator, labor rates and local market. A general breakdown:
- Alternator (parts): ~$100–$900+; luxury or imported vehicles run higher
- Labor: $125–$300, depending on how difficult the alternator is to access
- Replacement total (parts + labor): typically $225–$1,200
- Repair (brushes, bearings, etc.): ~$50–$350 when the alternator can be rebuilt rather than replaced
Final cost depends on your vehicle. You'll receive a written estimate before any work begins.
Typical service procedure
What's generally involved to diagnose and restore your charging system:
- Visual inspection of the alternator and drive belt for damage, corrosion, loose connections or wear
- Battery voltage test — confirm the battery reads ~12.6V with the engine off
- Charging-system voltage test — a healthy alternator produces ~13.8–14.8V at the terminals with the engine running
- Load test — run lights, A/C and radio to confirm voltage holds under load
- Output test — measure current output against the manufacturer's spec
- Diode test — check the AC-to-DC diodes for faults that cause battery drain
- Noise test — listen for grinding or whining that points to bearing failure
- Repair or replacement of the alternator as needed, then re-test
What is an alternator & what does it do?
The alternator is responsible for generating electricity to power your vehicle's electrical systems and to charge the battery while the engine is running. It converts mechanical energy from the engine into electrical energy through electromagnetic induction.
- Worn bearings: let the rotor spin smoothly; as they wear they cause friction, noise and eventual failure.
- Faulty voltage regulator: controls output voltage — when it fails the alternator over- or under-charges.
- Damaged diodes: convert AC to DC; failed diodes stop the battery from charging properly.
- Worn brushes / slipping belt: reduce or interrupt power generation.
- Overheating, corrosion or excessive electrical load: all shorten alternator life.
Signs your alternator needs attention
- Dimming or flickering headlights and interior lights
- Battery warning light on the dashboard
- Dead battery or frequent jump-starts
- Strange noises — grinding or whining from worn bearings
- Electrical glitches in power windows, seats or the radio
- Engine stalling when the charging system can't keep up
- Burning rubber or electrical smell
- Voltage irregularities — readings outside ~13.5–14.5V
Three steps. We come to you.
Get a Quote
Request a quote online or set up a time to have your vehicle looked at.
Pick a Time
Choose time slots that work for you. We confirm appointments and send reminders.
We Arrive
Our mechanics bring everything needed to you — just provide a safe area for the work.
A safe place to work.
Safe Location
A safe place to work — not on busy roads or unstable / steep surfaces.
Reasonable Weather
We don't perform repairs during severe weather, for safety and quality.
Permission
Authorization from the property owner or management — parking-lot work requires permission.
Legal Areas
We don't perform repairs in areas restricted by law.
Common questions.
How is Fixitfor.us different from other auto repair shops?
Do you service all makes and models?
What should I expect during my appointment?
Are you legitimate?
Why should I choose mobile vehicle repair?
What type of parts does Fixitfor.us use?
Do you perform roadside repairs?
Across West Michigan.
Primary: greater Grand Rapids — Comstock Park, East Grand Rapids, Grandville, Kentwood, Walker and Wyoming. Secondary, from our Belding location: Belding, Greenville, Ionia and the surrounding areas.
View Service Area →Get your alternator tested.
Request an estimate or call now. We bring expert alternator testing and replacement to your home or workplace.