Don't know if it would help but most of the Nissan that I have worked on have engine ground wire issues as they grow older due to corrosion. Firstly I would recommend that you make sure your battery connections are super clean and tight once you put them back on. Ground wires can easily be removed all corrosion sanded away and reinstalled. If your voltmeter is reading over 14.4 volts your alternator is over charging which will damage your battery and other components. The connections to the starter itself should be checked cleaned and tightened. It's a bit of work but all of it fairly easy prior to shelling out big bucks for batteries etc. Hope you find it soon.
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