What is an automotive relay? In simple terms, an automotive relay is a small cube shaped electronically operated electromechanical switch. It uses an. ... 86 Relay Coil Positive* 87 Common Contact; ...

The terminal numbers on these relays were always the same: 30, 85, 86, 87, and (sometimes) 87a or 87b, which are all from the DIN 72552 standard for automotive electrical terminals. DIY Actor ...