Scott
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Dan,
The power for the Webasto circulation pump is supplied by the Control Unit (Brain Box) mounted on the side of the burner. The “A” plug, the plug having only two wires is the power to the pump. Power is supplied to this plug any time the burner motor is on.
So, turn the burner on and check for voltage on the wires coming from the A-Plug. No voltage, bad box. Voltage present, bad pump or broken wire to the pump.
Hope this helps you.