I am going to install an onboard air system. When I look at various wiring diagrams for installing relays on the internet, I get confused. (Apparently I must have understood them at sometime in the past, because I have some extra relays in my tool box !! ). There is a pressure switch in this circuitry, but for my questions it’s not relevant.
The dash switch to engage the compressor’s clutch will receive “switched 12v”, from a convenient fused circuit on the dash. When the dash switch is closed it will send 12v to pin 86, and 87 will relay to the electrical clutch. But I’m not sure I can visualize what the connections on pins 30 and 85 will look like.
30 IS THIS CONSTANT 12v, DIRECT FROM THE BATTERY, WITH ITS OWN FUSE ?
85 ground feed from clutch compressor. DOES THIS CONNECTOR ALSO GO TO THE BODY GROUND ?
86 12v feed from the switch
87 12v feed to the compressor’s clutch
The dash switch to engage the compressor’s clutch will receive “switched 12v”, from a convenient fused circuit on the dash. When the dash switch is closed it will send 12v to pin 86, and 87 will relay to the electrical clutch. But I’m not sure I can visualize what the connections on pins 30 and 85 will look like.
30 IS THIS CONSTANT 12v, DIRECT FROM THE BATTERY, WITH ITS OWN FUSE ?
85 ground feed from clutch compressor. DOES THIS CONNECTOR ALSO GO TO THE BODY GROUND ?
86 12v feed from the switch
87 12v feed to the compressor’s clutch