Electric vehicles are becoming a more common sight on Ashburton roads, and buying a used one can be a great way to make the switch. However, unlike traditional petrol or diesel cars, the most important—and expensive—component is the high-voltage battery. That’s why getting specific electrical checks done *before* you buy is really important.
So, what should an auto electrician look at during a pre-purchase inspection (PPI) for a used EV?
1. High-Voltage Battery Health (State of Health – SoH)
This is the big one. The battery’s ability to hold a charge degrades over time. We use specialised diagnostic tools to read the battery’s State of Health (SoH), which is typically displayed as a percentage. A lower rate means less driving range compared to when it was new. Replacing an EV battery is very costly, so knowing its health beforehand is critical for judging the car’s value and future usability.
2. Charging System Check
We need to make sure the car charges correctly. This involves checking that the onboard charger is functioning as expected and inspecting the charging port for any damage or excessive wear. If possible, we’d check its charging from both a standard home supply and a faster public charger type if applicable.
3. High-Voltage System Inspection
EVs have complex high-voltage wiring and components. A qualified auto electrician needs to visually inspect these systems for any signs of damage, corrosion, or improper repairs. Safety is paramount with high-voltage systems.
4. Standard 12-Volt System
Like petrol cars, EVs still have a regular 12-volt battery that powers items such as lights, wipers, infotainment systems, and the computers that manage the high-voltage system. We check the health of this battery and the operation of all these standard electrical accessories.
5. Diagnostic Scan
Plugging in a diagnostic scanner can reveal any stored fault codes within the EV’s numerous control modules. This can highlight potential issues that aren’t immediately obvious.
Why Use an Auto Electrician?
Working with high-voltage EV systems requires specific training and equipment. It’s not something a general mechanic might be equipped for. An auto electrician experienced with EVs, like the team here at AutoSparks in Ashburton, knows precisely what to look for.
Getting a thorough pre-purchase electrical inspection provides peace of mind. It helps you understand the actual condition of the EV, particularly its expensive battery, allowing you to make an informed decision and potentially negotiate the price if issues are found. Don’t skip this step when considering a used EV – give us a call to arrange an inspection.
