The + & - need 12V. This would be to power the device.
I would guess that the 4 channels of A-B-C would be made up of a common, a normally open contact & a normally closed contact. You should have some documentation showing which is which otherwise you can test with a multi meter to figure which is which. I would use this device to drive an automotive type relay which in turn will power the spots. (Just my opinion)
What are you going to use the other 3 channels for?
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