Alternator Replacement in Bath
Dimming lights, a whining noise, or a battery that won't hold charge — we test and replace alternators on the driveway.
The alternator keeps your battery charged and your electrics running once the engine is on, so a failing one often masquerades as a flat battery — fitting a new battery without checking the alternator first just means you're back to square one within days. We test the charging system properly before recommending an alternator replacement, then fit and set up the new unit at your address.
Signs your alternator is failing
- The battery warning light stays on while driving
- Headlights and interior lights dim or flicker, especially at idle
- A high-pitched whining or grinding noise from the engine bay
- The battery keeps going flat even after a jump start
- Electrical accessories like windows or the radio behaving erratically
What causes alternator failure
- Worn carbon brushes reducing charging output
- A failed internal diode or voltage regulator
- A worn or slipping drive belt and pulley
- Water or road-spray damage to the internal windings
- General age-related wear after 80,000-100,000 miles
What to expect on the day
We test alternator output under load, along with the battery and drive belt, to confirm the alternator is the actual cause before quoting. Replacement typically takes one to one-and-a-half hours, followed by a test drive to confirm charging voltage is correct.
Is it safe to keep driving?
A failing alternator will eventually leave you stranded once the battery runs out of reserve charge, sometimes with little warning. If you're seeing dimming lights or a battery light, book a check promptly rather than risk a breakdown on the road.
Frequently asked questions
We load-test both the battery and the alternator's charging output before quoting, so you're never paying to replace the wrong part.
Battery light on or lights dimming?