Glow plug temperature control unit TCU (also called the Temperature Sensing Unit or TSU) for the HMMWV Smart Start System (S3). P/N 12480779-2. New/unused. Made in USA
For Nartron Smart Start systems. The control box must say Smart Start on the label.
Do not use with early version Prestolite / Nartron / KDS control boxes, such as the 12446779 EESS (Engine Electrical Start System).