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I'm on my 3rd S3 box in as many years. They just suddenly die for no apparent reason, even when you've covered all of the bases to prevent it. Unfortunately they're a common fail item that isn't cheap to replace because Uncle Sam has deep pockets. The only way around forking out the big coin is...

I also had an issue with fluctuating voltage readings, in my case at the engine harness cannon plug to the S3 connector. In spite of external appearances, corrosion inside the cannon plug itself was the culprit.

The best thing to do is pull apart all of the connections and grounds, and clean & inspect them thoroughly. Look for corrosion, damaged, clipped, and repaired wires and connectors. Take nothing for granted and assume nothing on these vehicles. Refer to the diagrams in TM 9-2320-280-20-2 Unit...

In the battery compt there should be a large POS cable going from the fwd stud that passes through the bulkhead going to the POS stud on the fwd battery. The big NEG cable comes from the shunt to the NEG stud on the aft battery. There's a cable connecting the two batteries together on the other...