12V 30/40 AMP RELAY & WIRE HARNESS SPDT 40A (PACK OF 5) 12V 5 Prong Relays with 5 Prong Sockets - You get 5 relays + 5 socket wires 30A / 40A for many applications - The contact colors are Yellow (common), Red (normally closed), and Blue (normally open. Heavy Duty Wire and construction 5 Pack, 30/40 AMP Relay Harness Spdt 12V Bosch Style