Precision Auto Electric on Main Street in Chula Vista has focused on automotive electrical diagnostics and wiring repair since 2010, operating from Suite G in the 91911 Otay auto-service corridor. The shop traces and repairs wiring-harness faults, MAF-sensor pigtail connections, headlamp circuits, and CAN-bus communication failures, the kind of specialized electrical troubleshooting that general tire-and-brake operations such as American Tire Depot refer out when standard scan tools reach their diagnostic ceiling. Starter-motor and alternator testing uses carbon-pile load benches to measure cranking-amp draw and charging-system voltage regulation under simulated full-load conditions. Late-model vehicles with multiplexed body-control modules require oscilloscope-level diagnosis of duty-cycle signals, and the shop's dual-channel lab scope captures waveform data on fuel-injector drivers, ignition coils, and variable-valve-timing solenoids. Fleet vehicles fueling at corridor stations including Propel Fuels schedule preventive electrical inspections at the shop to catch corroded grounds and voltage-drop faults before they escalate into no-start events. The highest-complexity jobs involve full engine-harness replacement with OEM-spec Delphi or TE Connectivity connectors, pin-fitted and heat-shrunk to factory crimp standards with continuity verification on every circuit before the harness is energized.