Your electric Mercedes-Benz still relies on a 12V system to power essential functions like lighting, dashboard electronics, safety sensors, and auxiliary modules. While high-voltage systems handle propulsion, the alternator and starter motor (in hybrids) remain vital for daily performance. At AT Technicians, we offer complete starter motor, alternator, and charging system checks specifically for Mercedes EVs and hybrids. We begin with a diagnostic scan of the 12V and auxiliary power systems, assessing output from the alternator and charging circuit. Our technicians inspect for voltage drops, charging irregularities, belt slippage, loose terminals, diode failures, or regulator issues. On hybrids, we test starter motors for torque consistency, electrical resistance, and start-up behaviour. Alternator belts and battery terminals are also examined for corrosion or slack. Using Mercedes-Benz dealer-level diagnostics, we validate the condition of every system that relies on the 12V infrastructure. We also check for control unit faults that may cause phantom drains or charging inconsistencies. Where components show weakness, we recommend quality replacements or recalibration. Routine auxiliary checks can prevent costly failures and ensure full system reliability. Book a professional charging system check with AT Technicians your EV and hybrid specialist in Mercedes-Benz servicing.