Ford Focus Wiring Harness | Auto Parts Warehouse Let the people with 12+ years of experience in finding and buying car parts help you find the best Wiring Harness for your Ford Focus. We here at Auto Parts Warehouse want to make sure you're happy with your car part purchases. Wiring Problems of Ford Focus - part 1 - carproblemzoo Ford Focus owners have reported 106 problems related to wiring (under the electrical system category). The most recently reported issues are listed below. Also please check out the statistics and reliability analysis of Ford Focus based on all problems reported for the Focus.