Brand New Heavy Duty Automatic Glow Plug Controller for all 1994-2002 C/K pick-up's, Suburbans and G/P Vans and cab/chassis trucks (school buses). 100% Made in USA!
This controller is what turns your glow plugs on and off by a signal from the computer. Replace when glow plugs are not operating properly. I recommend replacing every time to plugs are replaced as preventative maintenance or every 100K miles.