Parking brake warning light (also used as service brake system warning light). Fits the HMMWV, M35A3, etc. P/N 12356703-1. NSN 5980011870791. Made in USA. Indicator assembly is sealed from water, dust, and is vibration resistant. Illuminates red with white letters.
Indicator light is an LED and is polarity sensitive. For use on 24 Volt systems.
Wire #67 is (-) / Wire #27 is (+).