If it is not marked with a little cross, for PLUS and a minus sign, for NEGATIVE. Then really the only safe way is with a meter. This way you can be sure, and it won't matter witch way you hold it, to identify. You simply need a multimeter, to see whats positive or negative. Then mark it accordingly.
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If it is not marked with a little cross, for PLUS and a minus sign, for NEGATIVE. Then really the only safe way is with a meter. This way you can be sure, and it won't matter witch way you hold it, to identify. You simply need a multimeter, to see whats positive or negative. Then mark it accordingly.