Checking alternator/battery with engine running.... multi meter set to volts (20v) if it has settings directly to the battery terminals. If you get dodgy readings check alternator connections, engine earth and battery connections. Round post batteries; often when they have been disconnected a few times the clamps close up and even though you think they are tight they are not. loosen the clamp bolt and prise open the clamp lugs then refit the clamp and give it a gentle tap down to seat it on the post.... now tighten normally. Use Vasaline/petroleum jelly to maintain a corrosion free terminal!
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