The Industrial 12469158-2 Glow Plug Control TSU Module, manufactured by AM General / KDS / NARTRON, is an electronic temperature sending unit (TSU) that regulates the glow plug preheat cycle for AM General HMMWV diesel engines. It monitors coolant temperature, operates on 24 VDC, and communicates with the Start Control Box to determine glow plug timing for Detroit Diesel 6.2L and 6.5L engines. Mounting on the coolant crossover manifold, this TSU supports HMMWV M998, M1025, M1038, M1043 and related military vehicles, with alternate part number 6500398 and NSN 2920-01-469-6903.
