Electrical Repair at Johnny's Automotive
Shorts, parasitic drains, dead power windows, chewed wiring. Electrical faults get found by tracing the circuit with a diagram, not by swapping parts and hoping.
What if it isn't the battery, the alternator, or the starter?
Charging and starting problems get sorted on their own pages. This one covers everything else the wiring in your car does, and that list is long: power windows and door locks, interior and exterior lighting, blower motors, wipers, gauges that read wrong, accessories that work only when they feel like it, fuses that keep blowing, and the mystery drain that kills a perfectly good battery while the car sits in the driveway.
Parasitic drains are the most common reason people end up on this page. Every modern vehicle pulls a small amount of current while it is parked, just to keep modules and memories alive. When something refuses to go to sleep, a trunk light, an aftermarket accessory, a stuck relay, a module that keeps waking up, that small draw turns into a dead battery by morning. Finding it means measuring the actual current draw and then pulling one circuit at a time until the number falls where it belongs. That takes patience, not parts.
Wiring damage is the other big one. Heat, vibration, water intrusion, and rodents chewing insulation in a car that sits all take a toll. A chewed wire or a green corroded connector causes symptoms that make no sense on their own, like a window that only works when the headlights are on. We photograph what we find and send it to your phone, because damaged wiring is a lot easier to understand when you can see it instead of just hearing about it.
Our approach is circuit tracing, not parts roulette. Our ASE certified technicians pull the wiring diagram for your specific vehicle, scan every module for stored codes, then test power, ground, and signal at the points the diagram calls for. That is how a fault gets found once instead of guessed at three times. It costs diagnostic time up front, and it costs less than replacing parts that were never broken.
What's come through the shop lately
At our Lake Wales shop
5 electrical repair jobs at our Lake Wales shop in the last 90 days.
Vehicle
What we found
2012 Volvo XC70
Electrical Repair · Nov 2026
What Does It Mean When Multiple Lights Are Out?
The technician started with an initial assessment at no charge.
2010 Toyota Avalon
Electrical Repair · Oct 2026
Temp Gauge Says Error and the Cooling Fan Needs a Switch
At our Lake Wales shop, the technician found that the junction box under the hood on the driver side had failed, so the repair started there and the system…
At our Frostproof shop
3 electrical repair jobs at our Frostproof shop in the last 90 days.
Vehicle
What we found
2015 Chevrolet Silverado 3500 HD
Electrical Repair · Nov 2026
What Causes Power Windows to Quit at the Driver's Switch?
The technician performed an electrical diagnosis at the Frostproof shop, including testing and inspection of the affected system.
1996 GMC Yukon
Electrical Repair · Oct 2026
Why Do My Brake Lights Work Only Sometimes?
The technician at our Frostproof shop started with an initial assessment of the brake light concern at no charge.
At our Winter Haven shop
2 electrical repair jobs at our Winter Haven shop in the last 90 days.
Vehicle
What we found
2017 BMW X4
Electrical Repair · Nov 2026
Why Won't My Car Shift Out of Park?
The OEM gear selector part was a month out and outside the owner's budget, so the technician looked into alternative repair options.
2020 Jeep Gladiator
Electrical Repair · Oct 2026
Speedometer Goes Blank and Steering Vibrates at Speed
The technician performed an initial assessment at no charge and the ABS brake module (electrical portion) was approved as the repair.
At our Sebring shop
4 electrical repair jobs at our Sebring shop in the last 90 days.
Vehicle
What we found
2006 Chevrolet Trailblazer
Electrical Repair · Oct 2026
Windshield Wipers Won't Turn Off? Here's What Fixed It
The technician replaced the windshield wiper motor, removing components as required to access and install the new part.
2017 GMC Terrain
Electrical Repair · Oct 2026
Why Won't My Radio or Reverse Camera Work?
The vehicle came to our Sebring shop for a single visit to address the radio and reverse camera complaint.
At our Haines City shop
7 electrical repair jobs at our Haines City shop in the last 90 days.
Vehicle
What we found
2016 BMW 320i
Electrical Repair · Oct 2026
Chassis and Brake Warning Lights On After E-Brake Repair
The technician traced the warning light concern to the ABS Wheel Speed Sensor on the driver rear, which was the starting point for the main concern.
2010 Mercury Milan
Electrical Repair · Oct 2026
Headlight Bulb Out Reported at an Oil Change
The technician performed a headlamp bulb remove and replace.
At our Wauchula shop
1 electrical repair job at our Wauchula shop in the last 90 days.
Job
What we found
Electrical Repair
Oct 2026
Passenger Front Window Won't Go Up or Down: What Failed?
The Wauchula shop started with a no-charge initial assessment, and the technician updated the service manager within 30 minutes.
Choose your shop
Haines City, FL
4.8 (2,067) as of Nov 20264.8 out of 5, from 2,067 Google reviews, as of November 2026
31600 U.S. 27
Mon to Fri, 7:30 AM to 5:30 PM; Sat and Sun, closed
Frostproof, FL
4.8 (162) as of Nov 20264.8 out of 5, from 162 Google reviews, as of November 2026
101 North Scenic Highway
Mon to Fri, 7:30 AM to 5:30 PM; Sat and Sun, closed
Lake Wales, FL
4.8 (547) as of Nov 20264.8 out of 5, from 547 Google reviews, as of November 2026
323 North Scenic Highway
Mon to Fri, 7:30 AM to 5:30 PM; Sat and Sun, closed
Sebring, FL
4.7 (172) as of Nov 20264.7 out of 5, from 172 Google reviews, as of November 2026
435 North Orange Street
Mon to Fri, 7:30 AM to 5:30 PM; Sat and Sun, closed
Wauchula, FL
4.9 (34) as of Nov 20264.9 out of 5, from 34 Google reviews, as of November 2026
201 North 6th Avenue
Mon to Fri, 7:30 AM to 5:30 PM; Sat and Sun, closed
Winter Haven, FL
4.8 (592) as of Nov 20264.8 out of 5, from 592 Google reviews, as of November 2026
5100 Dundee Road
Mon to Fri, 7:30 AM to 5:30 PM; Sat and Sun, closed
Problems we fix
Our experts diagnose and resolve any issue.
The battery is dead every morning
Something in the car is drawing current while it sleeps. We measure the actual draw, then isolate circuits one at a time until the number drops back to normal.
A power window or door lock quit working
Usually a motor, a switch, or a wire broken inside the flex loom at the door jamb where it bends every time you open the door. Testing at the switch tells us which side of the circuit lost power.
The same fuse blows every time I replace it
Fuses do not fail on their own, they do their job. A repeat blown fuse means a wire in that circuit is shorting to ground somewhere, and it needs to be found rather than fed a bigger fuse.
Lights or accessories work sometimes
Intermittent faults are almost always connections: corroded pins, a loose ground, or a wire broken inside its insulation. Wiggle testing while watching voltage is how those get caught.
Chewed wires or a nest under the hood
Rodents go after wiring insulation, especially in vehicles that sit for stretches. We photograph the damage, repair the harness properly instead of taping over it, and check what else they got into.
Warning lights that do not match anything
Modules talk to each other over a network, and one bad ground or corroded connector can throw codes in systems that are perfectly healthy. That is why we scan every module before replacing anything.
What customers say about our electrical repair work
I am absolutely a fan of Johnny's Automotive! I brought them a 2011 Ford F-150 that was just riddled with electrical problems under the hood, causing engine failure. They were honest and upfront about the situation, kept me informed all the way through, and when they were done I ended up with a very reliable and good-running truck! I believe no one else would've had the patience and knowledge to get it done. Thank you Johnny's! I would definitely recommend to anyone in Polk County and beyond to choose this place for car/truck repairs...no question about it!
michael kolodziejski
Verified Google Review
I took my H3 in for electrical and safety issues. The service was exceptional! Great shout out to Jeffrey for having the most amazing customer service at the Winter Haven location. My truck had to be kept overnight and they gave me a loaner car. I have never experienced this at any other mechanic shop which puts them above the rest! My truck was successfully completed in a timely manner. If I could give more than 5 stars I would
TALITA JOHNSON SMITH
Verified Google Review
I needed a aux battery for my vehicle and Johnny's was able to get me in right away. I had been to the building when it was Ron's, boy has it changed. The place is immaculate. There is seating in the ac for waiting ,as well as a drink and munchies if you desire.The installation of my second battery didn't seen to take long at all,which means they know what they are doing as they are a pain in the butt to replace. The price was reasonable too. When I left there on my dashboard was a carnation. What a nice touch.I think they are going to be my go to.
Connie B
Verified Google Review
I have never taken my Audi to any shop outside Audi dealers….I had a battery emergency and at Johnny’s they took me right away and did an excellent Job. In the future if I need any car service I most likely use their shop again.
Gortinia58 Giana
Verified Google Review
Add called about a light for my left brake that was flashing and showing up the sign of not working. I was told by Pep Boys that I was wiring they couldn’t do it so I called Johnny’s automotive. They got me in right away same day and I was on my way and it was something so simple. I really appreciate the service the time they spent and the professionalism that was presented to me on that day of service. They have a fantastic team doing a wonderful job. I would definitely go back for anything. I keep their card with me at home so please visit them. They are great. They will take care of you.
DrA Aimoto
Verified Google Review
Had a problem starting my 2020 toyota corolla Johnny's pick it up put in a battery, did not try to sell me anything I did not need. Thank you for being honest, it hard to find that these days.
john draper
Verified Google Review
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Learn moreElectrical Repair questions, answered
Common questions about our electrical repair.
Why does electrical diagnosis take longer than other repairs?
Because the fault is almost never where the symptom is. Tracing a circuit means following the diagram from power through the switch, the module, the load, and the ground, testing at each point until the break shows itself. It is slower than swapping a part, and it is the only way to be right the first time.
Can you find a drain that only happens some nights?
Yes, though intermittent drains take longer than steady ones. Sometimes we need the vehicle overnight so we can watch the current draw over time and catch the module that is waking up. We will tell you up front if your symptom is the kind that needs to sit with us.
Can I just keep jump starting it until it gets worse?
You can, but every deep discharge takes life out of the battery, so you often end up buying a battery on top of the original problem. The drain is also still there and can leave you stuck somewhere inconvenient. It is cheaper to find the cause than to keep paying for the symptom.
Do you work on aftermarket stereos, alarms, and remote starters?
We can diagnose problems they cause, and add-on equipment is a common source of drains and strange faults because it gets spliced into circuits it was never meant to touch. We will trace what it is doing and show you what we find. If the right fix belongs with the installer, we will tell you that too.
How do I know I will not be paying to have parts guessed at?
We tell you what we are going to test and what that takes before we start, then come back with what we actually found and what it takes to fix it. Nothing beyond that happens without your okay. Brian and Niki built this shop on putting the customer over the money, and diagnosing before selling is what that looks like in practice.
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ASE Certified Technicians
ASE certified techs working on your vehicle
Flexible Drop-Off Hours
Convenient service options
20+ Years
2 decades of trusted service