I finally JUST GOT IT! Your "wall plug transformer" is also an AC to DC converter. These are a 2" x 2" cube with a cord and are used to back up battery powered devices, (ex. portable radio) that can be used where 120VAC is available to save the batteries. Great idea as these little converters have very low power consumption even while continuously powering the Bosch relay. Also, thanks for the web address, pin callout, and both schematics as I now know 86 is to +12V. This is important if you need a diode suppressed relay for a project. Any good with PLCs? Keep up the great thinking and ideas and posting so others can learn !!! Aquaally