When I remove the connectors from the old defective Variable Air Flow ECM and plug them into the V3 board, there is an extra connector on the V3 board that I have not used. What about that connector?

J Betancourt

That is normal. In addition to the 5-pin power connector, the QwikSwap® V3 can accommodate either a 4-wire digital connector (used on ECM 3.0 and Emerson, for example) or a 16-pin connector used on 2.0, 2.3 and 2.5 ECM motors.