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I don't think the negative reading on the meter is anything, just an anomaly within the meter, itself...or, since we're talking about DC, reversing the + and - probes will indicate a negative reading, i.e. if you connect the positive probe to the negative terminal of the battery, and the negative probe to the positive terminal, it will read a negative voltage. Maybe that's a clue if you're sure you tested positive to positive and negative to negative.
Not likely to be your issue, but worth checking - the braided ground strap between the engine block and chassis on the left side of the engine compartment. These tend to corrode and cause issues. Check it, make sure it isn't frayed or corroded. Whitish/greyish dust like residue, or a green tint, indicated corrosion.
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