Modern vehicles rely heavily on advanced electrical systems — from the alternator that powers your battery to the sensors, wiring, and computers that control nearly every function of your car. When something goes wrong, you need more than a basic mechanic — you need experts who understand the intricate network behind your vehicle’s performance.
At Johnston & Magwood Tires & Auto, our certified technicians specialize in auto electrical repair and diagnostics for all makes and models. With over 80 years of trusted automotive service in Mississauga, we combine deep expertise with the latest diagnostic technology to quickly identify and fix electrical problems the right way — safely, efficiently, and cost-effectively.
Whether it’s a flickering headlight, a dead battery, or a complex wiring fault, we’ll get to the root of the problem and restore your car’s performance with precision and care.
Get clear, straightforward answers to the most common questions from our customers.
Common causes include bad connections, blown fuses, faulty alternators, weak batteries, or worn wiring insulation.
If your car won’t start, the battery light is on, or your lights dim while driving, we can perform a quick diagnostic test to determine the cause.
Yes. Faulty wiring or sensors can lead to rough idling, misfires, poor fuel efficiency, and even stalling.
Absolutely. Our technicians are trained to safely inspect and repair both traditional and high-voltage systems found in hybrids and EVs.
We recommend testing your battery and charging system at least once a year — or before winter, when electrical demand is highest.
