Car battery charger which colour wires from the charger to the battery?

Smiling JW

New member
Is it red to (-) and black to (+)?
The wire is red black & black.

If I connect them red black to (-) and black to the (+) I can get an amp reading but not the other way round.
meesterbond it only has wires it is an old charger that sees daylight about once a year.
 
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