3172170 Steering Column Switch Turn Signal For FH12/FH16/FM12

This OE 3172170 turn signal steering column switch is a core control component engineered for FH12/FH16/FM12 heavy duty trucks, constructed with high-toughness wear-resistant plastic and premium conductive metal elements to deliver precise signal triggering, stable circuit conduction and long-lasting anti-aging performance, with ultra-accurate dimensional machining that strictly matches the original installation specifications of FH12/FH16/FM12 models for a hassle-free direct fit installation without additional modification; its ergonomic key design features sensitive touch and smooth rebound, ensuring reliable and quick control of the vehicle's turn signal on/off functions to transmit clear driving signals and enhance road travel safety, and the integral sealed structure effectively prevents dust, moisture and road debris from entering the internal circuit, making it a high-quality original-spec replacement part that maintains the stable operation and control reliability of the FH12/FH16/FM12 truck's steering control system even under frequent long-term use and harsh working conditions.