The neg/ pos post MAY show continuity in at least one direction (reverse your meter leads) for a number of reasons
Loads permanently connected such as stereo or alternator WHICH HAVE solid state devices
AND something along the line of a radio supression cap the charging current of which will temporarily show continuity, and depending on the sensitivity of the ohmeter, may be hard to resolve
For example, if you reverse battery connections on an alternator (output stud to case) it will be a direct short because of the rectifiers. Likewise, a stereo/ radio or remote amplifier
I almost NEVER use continuity, except down to the "last switch and wire" of a problem. I almost always use "hot" which is why I suggested the series bulb. This allows you to "see" what is going on, as well as measuring current through a fault
Ohmeters are way too sensitive, can be damaged if any voltage present, and can lead you down a rose path "generally."
