Content Wrapper

[jeshua]

doublejfj previously said:

If you're not using it, just don't wire anything to it in your setup. It can be very useful in some applications though.

Let's theoretically create an application here where the relay is used to switch on and off the power to an add-on fuse panel (such as the Blue Sea Systems one) with an add-a-circuit tapping an ignition source from the fuse panel. The 87a terminal will make voltage available in the "off" mode of the relay.

Consider the following scenario:
Let's say that you have your source connected directly to the constant battery source on terminal 30. Connected to terminal 86 is an add-a-circuit with power coming from your fuse panel off an ignition-switched source. You also have another wire from a ground to terminal 85, providing the ground for the coil. Your fuse panel is then connected to terminal 87, giving it power when the ignition is switched on (coil circuit completing). Still with me?

Let's now think about the possibility of connecting something up that turns on when your key is off. Think those little blinking lights that car alarm systems have: they come on when the car is off, right? Well, that's something like what you could connect to the 87a and when the ignition was off and the coil circuit was dead, the armature falls back onto the 87a terminal, providing power to whatever you want to use when the car is off.

Make sense?

Ok that makes sense. Thanks for the schooling.