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.
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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.
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Learn moreElectrical Repair questions, answered
Common questions about our electrical repair services.
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 Johnny 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
Decades of trusted service