Mobile Electrical Diagnostics in Stone Oak, TX

Electrical Diagnostics in Stone Oak

Newer family vehicles carry dozens of control modules, power liftgates, rear entertainment and phone integration, and any of them can drain a battery overnight if it fails to go to sleep. If your SUV is dead in the driveway on school mornings, a parasitic draw is a likely cause.

How We Find a Drain

We let the vehicle's modules go to sleep, then measure current draw at the battery and pull fuses one circuit at a time until the draw drops. That points to the circuit at fault, and from there to the module or accessory. Aftermarket add-ons like dash cameras and remote starters are common sources and get checked first.

Many Warning Lights at Once

A dashboard full of warnings at the same time usually points to a communication fault between modules, a weak battery, or a poor ground, not five separate failures. We scan every module, look for network communication codes, and test battery voltage and grounds before chasing individual warnings.

Liftgates, Windows and Locks

Power liftgates, sliding doors and windows use motors, switches and wiring that flex every time a door opens. Broken wires in the hinge area are a common cause of windows or locks that work only some of the time. We test the motor, the switch and the wiring through the hinge before replacing parts.

Why the Battery Keeps Dying

A new battery only buys time if something is draining it. We test the battery, measure charging voltage, and measure the draw with the car asleep, so you learn why it died, not just that it did.

Cost

$95 diagnostic fee (credited to repair). We come to your home off US-281 or Sonterra Boulevard.

Prices, warranty and the full checklist for this job: Electrical Diagnostics in San Antonio.