using relays

[lit666]

Those that have worked with relays before? I have no idea what number does what.

from what I can tell,

30 = 12v pwr (20a fuse)
85 = ground
86 = ?
87 = 12v out (20a fuse)

is 86 the 12v (signal in)?

[Windsors 03 Cobra]

Yes 86 is the 12V+ trigger.


* 30 is the common or input voltage to be switched. There should be a fuse on this wire - use whatever you need to to power your accessory. Check your accessory's documentation for details on the unit's expected draw.

* 87a is the normally closed connection. This terminal is hot when the relay isn't energized, it is unpowered when the relay is energized. (This terminal is generally not used, unless you want an LED or bulb to light when the relay is switched OFF)

* 87 is the normally open connection. Powered only when the relay is energized. This is the connection that goes live when the relay is switched on.

* 86 is connected to the positive 12V of the triggering voltage.

* 85 is connected to the ground of the triggering voltage.

[Reverend Cooper]

think of it as a switch that when closed with low volt/low amps, its closeing the circuit on the high vol/amp side thats usually being supplied by heavier wiring.

[lit666]

Well I can just ground 85 directly to the car correct. I don't need to run it to the same ground point as the trigger.

[Windsors 03 Cobra]

Well I can just ground 85 directly to the car correct. I don't need to run it to the same ground point as the trigger.

Of course.