Because the fan supply will be operated floating relative to the car chassis and 12V system, we could simply use one of my MIMA home made fan adapters with both conductors brought out to the 4 conductor charging plug. This will avoid splicing into the fan wires and make it erasy to remove if required.
The fan return line is only connected to ground when the car is powered up and running at full 12V, or through a resistor for low speed.
The charger fan supply can be in parallel at the fan connector since relays open the circuit when the car is not powered up.
For the connector, I think that Anderson connectors are a bit of an overkill for the 1A current we will be passing through it.
To cover the connector when not charging, it may be easier to find a connector that does not have a cover, and simply plug in a dummy mating connector to cover the holes?
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