you should find near-zero resistance between terminals 1 and 2 (normally closed)

When should I use a rebuild kit instead of just a repair kit

the B171 features a self-cooled

This specific model is an official York OEM part designed for York

Carrier 50TJ400985 Harness THPU32HP7Y you should find near-zero resistanceThe Carrier 50TJ400985 Harness is an essential OEM electrical component engineered for precise integration within Carrier 50TJ rooftop units and high tonnage package systems. This HVAC wiring harness ensures reliable point to point electrical continuity between the integrated furnace control and peripheral sensors, preventing intermittent signal loss common in high vibration rooftop environments. Designed for rapid field replacement, the 50TJ400985