Phillips & Temro 3100127 LIT PLUG 3100109

3100127. Block heater plug that is lit when power is reaching the heater harness. BENEFITS. Light is visible from 50 feet making it possible to monitor from a distance. Visual cue to indicate power to the block heater. Harnesses may be purchased to upgrade existing block heater kits. WHERE TO USE. Automotive Industry. Offered on popular aftermarket block and cartridge heater kits.