Here it is the wiring diagram drawn in color. It was derived by me from a black and white printed diagram from Honda. Inspecting the original drawing I spotted two erros: there were two missing joints. Both were in the main harness, one on the green wires and the other in the white/green wires.

Here it is the the PDF version: Honda NTV650 Revere wiring diagram (PDF).

After disassembling the carburetors you may want to force the fuel to fill them again. Using the start button and letting the entire engine rawwing for a long time may be an high load for the battery, so you may prefer to provide 12 V directly to the pump connector.

In this photo you see the polarity (red is positive and black is negative) of the connector from the wiring harness to the pump:

You will hear the noise from the working pump. Ance the carburetors are full, the pump will stop.