Restore full functionality of glow plugs to ensure easier cold starting with a Sinister Diesel Glow Plug Relay. Symptoms of a bad glow plug relay are difficulty or the inability to start your engine in cold weather. The Sinister Diesel Glow Plug Relay is built to OEM specifications with reliability and ease of installation in mind. It drops right into the factory location to get you back on the road., Features:Meets or exceeds OEM Specifications, Precision manufactured for perfect fit, Restores ability to start easily cold climates, 2-Year Warranty,