The Standard Ignition SS 591 SI Diesel Glow Plug Relay is engineered to ensure reliable engine start ups in cold conditions by effectively managing the glow plug system This relay is compatible with various diesel engines including those in Buick Cadillac Chevrolet GMC Oldsmobile and Pontiac vehicles It features heavy duty copper contacts that minimize arcing thereby extending the solenoid s lifespan The use of pure copper windings enhances the magnetic field strength contributing to efficient engine start ups Additionally the relay incorporates polyester insulated magnet wire cadmium plated copper discs and solid contact bolts to reduce voltage drop ensuring full battery power is delivered to the starter and glow plugs The pure copper battery terminal studs further decrease resistance allowing higher current flow even in high temperature environments Designed with a mounting bracket for easy installation the SS 591 SI relay operates at 12 volts and has amperage rating of 100 A Its robust constructiond high quality materials make it a reliable choice for maintaining optimal engine performance during cold starts