Mechanical
Starters & Alternators
Reliable starts, every morning.
Starting and charging system testing, repair, and replacement as a complete circuit.
Overview
Clicking when you turn the key isn't always the starter — and a new battery won't fix a failing alternator. Jack's tests the entire starting and charging circuit under load before recommending parts.
We clean corroded terminals, measure voltage drop across cables, and load-test batteries cold — the way Michigan mornings actually stress your electrical system.
Every starter and alternator replacement includes verification that the circuit that killed the last one won't kill the new one.
How Jack's approaches this
- Battery load test at rest and under crank
- Alternator output test at idle and 2,000 RPM
- Starter draw test and ring gear inspection
- Cable and terminal resistance measurement
What to expect
Typical timeline
Same day for most starter and alternator jobs
Investment range
Call for a written estimate
Parts standards
- Quality reman or new rotating electrical
- Anti-corrosion terminal protection
- Correct amp alternator for vehicle options
Vehicles we see
- Cold-weather commuters
- Vehicles with high electrical load — rear heat, lights
- High-mileage factory units
What's included
Starter replacement
New or remanufactured starters with proper shim and torque.
Alternator service
Output verified before and after replacement.
Battery testing
CCA test and terminal service.
Cable & ground repair
Fix voltage drops that kill components early.
When to visit
- Clicking but no crank
- Slow crank especially when cold
- Battery light on dash
- Dim headlights at idle
- Frequent jump-starts needed
- Burning smell near alternator
Our process for this service
01
Battery baseline
Resting voltage and load test CCA.
02
Crank & charge test
Starter draw and alternator output under load.
03
Circuit inspection
Cables, grounds, and terminals for resistance.
04
Component replacement
Only failed parts replaced — battery, starter, or alternator.
05
Verify cold start
Crank speed and charging voltage confirmed.
Why Jack's
Parts stores test batteries free but skip cable drops. We test the circuit — that's why your third battery finally works.
— Sam, owner · Meet the team
Michigan drivers
January cold reduces battery capacity 30–40%. We size replacements for Michigan winters, not Arizona spec sheets.
Frequently asked questions
Gallery
Related shop work
Real vehicles from Jack's bays — collision refinish, custom wheels, mechanical repair, and the Fort Street shop our neighbors know.
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Work you can stand behind
Jack's stands behind the repairs we perform. Mechanical and collision work is completed to documented standards, with written estimates before work begins and a clear explanation of what's covered when you pick up.
View warranty details →Related services
Need starters & alternators?
Call us during business hours or request a free quote.