Car Electrical Repair Near Me in Rohnert Park
TL;DR - Quick Answer:
Need car electrical repair near you? Rohnert Park Transmission & Auto Repair provides expert electrical diagnostics and repair — batteries, alternators, starters, wiring, computer modules, and parasitic drain testing. ASE certified technicians, free battery testing, same-day service, nearly 30 years experience, BBB A+ rated. Call (707) 584-7727 for immediate help.
Car won't start? Lights flickering? Dashboard warning lights? Modern vehicles depend on complex electrical systems with dozens of computer modules and miles of wiring. When something goes wrong, you need a shop with the diagnostic tools and expertise to find the real problem — not just swap parts until something works. Our ASE certified technicians provide systematic auto electrical diagnosis and repair for all makes and models.
Common Car Electrical Problems We Fix
TL;DR: From dead batteries and failing alternators to wiring problems and computer module failures, we diagnose and repair all automotive electrical issues with professional-grade equipment.
Battery Failure
Dead battery, slow cranking, dim lights at startup. Batteries typically last 3-5 years. We test battery health and charging system to determine if replacement is needed.
Alternator Problems
Dimming headlights, battery warning light, frequent dead batteries, whining noise from the engine. A failing alternator cannot keep your battery charged.
Starter Failure
Clicking when turning the key, grinding noise, intermittent no-start, engine cranks slowly. Starter motors wear out over time and eventually fail completely.
Wiring & Connection Issues
Intermittent electrical problems, blown fuses, corroded connectors, rodent-chewed wires. Wiring problems cause unpredictable symptoms that worsen over time.
Computer Module Failures
Multiple warning lights, erratic vehicle behavior, communication errors. Modern vehicles rely on dozens of computer modules that can fail from age, moisture, or electrical surges.
Parasitic Battery Drain
Battery dies overnight or after sitting a few days. Something is drawing power when the vehicle is off — aftermarket accessories, stuck relays, or faulty switches.
How We Diagnose Electrical Problems
TL;DR: Systematic, data-driven diagnosis — not guesswork. Our process identifies the exact fault so you pay for the right repair, not unnecessary parts.
- Computerized diagnostic scan reads all vehicle computer modules and fault codes
- Battery load test and charging system analysis (voltage, amperage, ripple)
- Starter draw test to measure motor condition without removal
- Voltage drop testing across circuits to find hidden resistance and bad grounds
- Parasitic current draw test to isolate overnight battery drain sources
- Wiring continuity and insulation testing for damaged or corroded wires
- Oscilloscope analysis for intermittent electrical signals and sensor waveforms
- Module communication testing to verify all computers are talking to each other
Why Professional Diagnosis Matters
Modern vehicles have 30+ computer modules, hundreds of sensors, and miles of wiring. Guessing at electrical problems wastes money and leaves you stranded again:
- Replacing a battery when the alternator is failing — new battery dies in days
- Swapping a starter when a corroded ground wire is the real problem
- Clearing check engine codes without fixing the underlying electrical fault
- Missing a parasitic drain that keeps killing new batteries
- Ignoring rodent-chewed wiring that creates fire risk
Our Auto Electrical Repair Services
TL;DR: From battery replacement to computer module programming, we handle every aspect of automotive electrical systems. Same-day service available for most repairs.
| Service | Estimate |
|---|---|
| Battery Testing & Replacement | Free test / Call for quote |
| Alternator Repair / Replacement | Call for quote |
| Starter Repair / Replacement | Call for quote |
| Wiring Repair & Harness Service | Call for quote |
| Fuse & Relay Diagnosis | Call for quote |
| Parasitic Drain Testing | Call for quote |
| Computer Module Diagnostics | Call for quote |
| Sensor Replacement | Call for quote |
Pricing varies by vehicle make/model and repair complexity. Call (707) 584-7727 for a free estimate. Visit our starter and alternator repair page for more details on those specific services.
Our Electrical Repair Process
TL;DR: Systematic diagnosis, clear communication, expert repair. We find the real problem first — no guesswork, no unnecessary parts.
Symptom Review
Discuss your symptoms, when they occur, and vehicle history
Systematic Testing
Scan tools, multimeters, and oscilloscopes isolate the fault
Clear Explanation
Plain-language report of the problem and repair options
Expert Repair
Quality parts, proper techniques, ASE certified technicians
Verify & Test
Full system test to confirm the repair and prevent recurrence
Why Choose Us for Car Electrical Repair?
ASE Certified Electrical Specialists
Our technicians hold ASE certifications with specialized electrical system training. We use systematic diagnostic processes, not trial-and-error part swapping.
Professional Diagnostic Equipment
Dealer-level scan tools, digital multimeters, oscilloscopes, and current clamps for accurate diagnosis of even the most complex electrical problems.
Free Battery & Charging System Test
Complimentary testing of your battery health, alternator output, and starter draw. Know exactly what is wrong before spending money on repairs.
BBB A+ Rated, ATRA & AMRA MAP Certified
Family-owned for nearly 30 years. ATRA certified, AMRA MAP Participating Facility with MAP-Qualified technicians, and RepairPal Certified. Your vehicle is in expert hands.
All Makes & Models — All Electrical Systems
Domestic, Japanese, European, Korean — we have manufacturer-specific diagnostic tools for Ford, GM, Toyota, Honda, BMW, Mercedes, VW, Audi, Hyundai, Kia, and more.
Same-Day Service for Most Repairs
Battery replacement, starter and alternator service, fuse repairs, and many wiring fixes completed the same day. We get you back on the road fast.
Electrical Problems? We'll Find the Real Cause.
Electrical issues get worse over time. A flickering light today can become a no-start tomorrow. Call now for expert diagnosis and same-day repair.
Car Electrical Repair Near You in Sonoma County
We serve drivers throughout Rohnert Park, Santa Rosa, and the greater Sonoma County area with expert auto electrical diagnosis and repair. Click your city for location-specific information.
Car Electrical Repair FAQs
Common questions about car electrical problems and repairs, answered by our ASE certified technicians.
What are the most common car electrical problems?
The most common issues are battery failure (typically after 3-5 years), alternator problems (dimming lights, battery not charging), starter failure (clicking sound when turning key), blown fuses, parasitic electrical drains that kill batteries overnight, wiring problems from age or rodent damage, and failing sensors that trigger warning lights. Our computerized diagnostics pinpoint the exact issue quickly. Call (707) 584-7727 for a free initial assessment.
How much does car electrical repair cost?
Electrical repair costs vary widely depending on the specific problem. A simple battery replacement or fuse fix is a quick, affordable job, while tracking down an intermittent wiring issue or replacing a computer module takes more diagnostic time. We provide a detailed diagnosis and upfront estimate before any work begins — no surprises. Call (707) 584-7727 for a free estimate specific to your vehicle.
My car won't start — is it the battery, starter, or alternator?
All three can cause no-start conditions, but the symptoms differ. A dead battery shows dim dash lights and slow cranking. A bad starter produces a clicking sound with bright dash lights. A failing alternator often causes progressively dimming lights and frequent dead batteries. We test all three with professional-grade equipment to find the real culprit — no guessing and no unnecessary part replacement.
Can electrical problems cause my check engine light to come on?
Yes. Many check engine light codes relate to electrical issues — sensor failures, wiring problems, communication errors between computer modules, and ground faults all trigger warning lights. Our diagnostic equipment reads manufacturer-specific codes and tests the underlying electrical circuits to find the root cause, not just the symptom. Visit our check engine light diagnostics page for more information.
Do you repair electrical problems on all vehicle makes and models?
Yes. Our ASE certified technicians repair electrical systems on all makes and models including domestic (Ford, Chevy, GMC, Dodge), Japanese (Toyota, Honda, Nissan, Subaru), European (BMW, Mercedes, VW, Audi), and Korean (Hyundai, Kia) vehicles. We have the manufacturer-specific diagnostic tools needed for each brand's unique electrical architecture.
Why do car electrical problems need professional diagnosis?
Modern vehicles have 30+ computer modules, miles of wiring, and hundreds of electrical connections. Guessing at the problem — like replacing a battery when the alternator is actually failing — wastes money and does not fix the issue. Professional diagnosis with scan tools, multimeters, and oscilloscopes finds the actual root cause quickly, saving you time and money in the long run.
What causes parasitic battery drain?
Parasitic drain happens when something continues drawing power after the vehicle is off. Common causes include aftermarket accessories (dash cams, alarms, stereos), stuck relays, faulty door switches, trunk light switches, and module wake-up failures. We use specialized current draw testing to isolate which circuit is draining your battery. Call (707) 584-7727 for diagnosis.
How long does car electrical repair take?
Simple repairs like battery replacement or fuse service take under an hour. Starter or alternator replacement typically takes 2-4 hours. Wiring repairs and intermittent electrical diagnosis may take 3-6 hours depending on complexity. We provide time estimates upfront and keep you informed throughout the process. Same-day service is available for most electrical repairs.
Do you offer free electrical system testing?
Yes. We offer complimentary battery testing and charging system checks. Our ASE certified technicians test your battery health, alternator output, and starter draw at no charge. If a deeper electrical diagnosis is needed (wiring, computer modules, intermittent issues), we explain the diagnostic process and cost before proceeding. Call (707) 584-7727.
Can rodent damage to wiring be repaired?
Absolutely. Rodent damage to automotive wiring is common in Sonoma County, especially during cooler months when rodents seek warmth under the hood. We repair chewed wiring with proper splicing techniques, replace damaged connectors, and restore full electrical function. We can also advise on prevention methods to protect your vehicle from future rodent damage.
Related Electrical & Diagnostic Services
Get Expert Car Electrical Repair Near You Today
Free battery testing. Same-day service. ASE certified technicians. Serving Rohnert Park and all of Sonoma County since 1989.