How a Relay Works - How to Connect N/O, N/C Pins | Homemade Circuit Projects
MFJ Auto Electrical - π»ββββββ βββ‘ββ€ββ£ β¦ββ£β 4 βββ β‘ββββ¨π πΉ4 pin relays use 2 pins (85 & 86) to control the coil and 2 pins (30 & 87) which switch power