How Can The Polarity Be Declared?

Anyway, the safest and most efficient way is to make a reverse polarised adapter: you need a spare plug and line socket of the type that fits the socket on the generator.

Wire the plug to the line socket with 30cm / 1 foot of cable. At the line socket, reverse the polarity so that the red wire goes to the black pole and the black wire goes to the red pole (or whatever colours you are using).

Attach a label to the adapter that says:

REVERSED POLARITY !!!

Then you can plug your cable into the line socket as if it were being plugged into the generator, but the [+] and [-] poles are reversed. Be aware you will blow the protections or even the device itself on some DC equipment if you forget and connect this to anything that takes a normally polarised DC supply.

If the chassis socket on the generator has been wired wrongly so that it is reverse polarised, then take it off and wire it correctly.

Thanks

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Troublshooter101