The device that I connected to the external relay output only half works. What is the most likely problem?
Sounds like the alarm/light/solenoid/other device connected to the external relay is drawing too much power. The Console has protection circuitry built into it to prevent damage caused by overloading. The protection circuitry works by reducing the voltage so that the power is reduced to safe limits. The way to check is to measure the voltage supplied to your device and see if it is much less than the battery voltage. If so, then the Console is protecting itself. The solution is to fit a high power relay to provide your device with enough power.
