Generator Repair Services
in Gallatin, TN
A generator that won't start during an outage is worse than no generator at all — it gives you false security. Whether your standby unit is showing a fault code, failing to transfer power, or cranking but not starting, our licensed electricians diagnose and repair the electrical side of all generator makes and models in Gallatin.
Expert Generator Fault Diagnosis in Gallatin, TN
A standby generator is a sophisticated system combining a small internal combustion engine, a permanent magnet or brushless alternator, an electronic voltage regulator, a starting battery, and an automatic transfer switch (ATS) — all of which can fail independently of one another. When your generator shows a warning light, fails a weekly exercise test, or simply doesn't start during an outage, diagnosing the fault requires understanding both the mechanical engine side and the electrical distribution side.
Our licensed electricians specialize in the electrical components: the ATS relay contacts and wiring, the voltage regulator and output connections, the battery charging circuit, and the panel-side connection integrity. We work alongside mechanical technicians or can refer you to qualified engine service partners if the fault is purely mechanical (fuel system, carburetor, or engine compression).
Common Generator Failures We Diagnose & Fix
- Fault Code Display: Red or yellow LED fault codes on Generac, Kohler, Briggs, or other controller panels. We read and interpret fault codes and address the specific subsystem failure indicated.
- Failure to Start: Click sounds, slow cranking, or no cranking at all — typically caused by a dead or sulfated starting battery (the #1 cause of generator failures), a failed starter solenoid, or a failed choke actuator.
- Engine Starts But No Power Output: Generator cranks and runs but produces no electricity — indicating a failed voltage regulator, open alternator winding, or failed output circuit breaker inside the generator cabinet.
- ATS Won't Transfer: The generator starts but the transfer switch relay doesn't close, leaving your home without power. ATS relay failures, wiring faults, or control board issues cause this.
- Generator Runs But Trips Immediately: A nuisance shut-off often caused by an overloaded circuit, a failed GFCI in the output circuit, or a wiring fault between the generator and the panel.
- Battery Not Charging: The generator's float charger circuit keeps the starting battery topped up. When this circuit fails, the battery drains over weeks and the unit won't start at the next outage.
Our Repair Services
Starter & Battery Repair
Testing, charging, and replacing starting batteries and diagnosing starter solenoid and relay failures that prevent generator cranking.
Automatic Transfer Switch Repair
Diagnosing and repairing ATS relay contacts, wiring harnesses, and control board faults that prevent the generator from supplying your home during outages.
Voltage Regulator Replacement
Replacing failed automatic voltage regulators (AVR) that cause low, high, or unstable output voltage — protecting your home's appliances and electronics.
Panel & Output Wiring Repair
Inspecting and repairing the wiring connections between the generator output breakers and your home's main panel for safe, code-compliant power transfer.
Transfer Switch Repair
Diagnosing and repairing automatic transfer switches that fail to detect outages, transfer power slowly, or refuse to switch back to utility power after the grid is restored.
Load Test & Verification
After completing any repair, we perform a full load test — running the generator under actual electrical load to confirm it operates reliably before we leave.
Our Generator Repair Process
Fault Code Reading
We connect to the generator's control board and read stored fault codes that identify the specific failure mode before any disassembly.
Component Diagnosis
We test the starter battery, charging system, fuel delivery, ignition, and control board functions to isolate the exact failed component.
Parts Procurement
We source manufacturer-genuine or OEM-equivalent replacement parts — never cheap aftermarket parts that fail again quickly.
Repair & Load Testing
After completing the repair, we run the generator under actual load to verify it performs at rated output before leaving.
Benefits of This Service
- Restores backup power protection before the next storm season
- Fault code diagnosis prevents replacing parts that aren't actually failed
- Load testing after repair confirms the fix — not just that it starts
- Genuine parts extend the repaired component's service life
- Repair is often more cost-effective than premature generator replacement
- Written repair report documents all work for manufacturer warranty records
Why Choose Us in Gallatin, TN
- We read fault codes before ordering parts — no guesswork replacements
- Genuine manufacturer or OEM-equivalent parts only
- Load testing included after every repair — not just a startup test
- All brands serviced — Generac, Kohler, Briggs & Stratton, Cummins, Champion
- Written repair documentation provided for your warranty records
- Emergency repair service available before major storm events
Common Projects We Handle
- Generator that won't start during an outage — starter or battery diagnosis
- Generator that starts but immediately shuts down — fuel delivery or control board fault
- Transfer switch that fails to switch over during an outage
- Generator that runs rough or produces low voltage under load
- Control board replacement for a generator throwing a persistent fault code
- Generator that ran out of oil and locked up — assessment and rebuild or replacement
⚠️ Warning Signs You Need This Service
- Generator produced a fault code and shut down during a self-test
- Generator won't start at all — battery, starter motor, or control board issue
- Generator starts but shuts down after a few minutes of operation
- Generator is producing audible knocking or running rough under load
- Automatic transfer switch doesn't activate when power is cut in a test
- Generator is burning excessive oil or emitting blue or black smoke