Ford Transit-350 HD high mounted brake light power issue with wiring harness connections on Ford Transit-350 HD

Submitted by Vehicle Owner · Jun 23, 2025
Published by RepairPal

Problem overview

Some Ford Transit-350 HD owners report experiencing power issues with the high mounted brake light, often linked to wiring harness connections. These problems can stem from common issues such as corrosion, broken pins, or damaged wires, which may compromise the light's visibility and safety for drivers behind the vehicle. Additionally, a blown brake light fuse could indicate a short circuit caused by frayed or improperly insulated wires, necessitating thorough troubleshooting. Owners are advised to inspect wiring connections for signs of damage or loose connections that could affect the power supply. Discrepancies in power supply between the high mounted brake light and other lights, like the cargo light, should also be investigated to identify underlying issues. Furthermore, the brake warning light serves as a critical alert for potential braking system problems, emphasizing the need for immediate attention to maintain safety on the road.

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