Installation manual

14
RELAY ACTIVATION METHODS
12 VOLT ACTIVATED RELAY
A 12 volt activated relay is constantly grounded and will only send power out of
the output side of the relay when 12 volts is applied to the relay, as the name implies.
The 12 volt source can be wired directly to the relay or interrupted by a switch, as
shown in the 12 VOLT SOURCE ACTIVATION drawing.
Wiring directly to the relay would be used in the case of wiring a Fuel Pump relay or
any other high amperage component you would want to run continuously while the key
is in the on position. In these cases, make certain the 12 volt wire you are using is a
Switched 12 volt wire and not a battery constant.
The 12 volt activation wire can also be wired to a switch to offer the user OFF/ON
capabilities. These are the situations a battery constant power source could be used.
This would allow a component to be turned OFF or ON without the key in the ON
position. However, unless a lighted switch is being used, a ground activated relay may
work better to avoid running power through the switch. In the event that a switch is
being used, make sure the amperage of the 12 volt source does not exceed the
capabilities of the switch.