How it's done on-site
The mechanic disconnects the battery, removes the serpentine belt, unbolts the alternator, installs the new unit, and verifies charging voltage (roughly 13.8–14.6 volts with the engine running).
Signs your alternator is failing
Dimming headlights, a battery or 'ALT' warning light, a whining noise from the front of the engine, and repeated dead batteries are the common symptoms.
Battery or alternator?
A battery that tests good but goes flat after driving points to the alternator. A professional charging-system test confirms which one failed so you only replace one.
Cost in Texas
Expect $299–$750 installed, depending on the vehicle and whether you choose new or premium remanufactured.
Frequently asked questions
How long does an alternator last?
Typically 7–10 years or 100,000–150,000 miles.
Can I drive with a bad alternator?
Only until the battery drains — often 20–60 minutes.
Will a new battery fix a bad alternator?
No. The new battery will drain too.
Related services
- Mobile starter & alternator repair — No-start and charging problems fixed where you're stuck.
Need a mobile mechanic near you?
Our mobile mechanics can come to you today. Call 469-813-8778.