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he can load test the batteries individually. https://www.harborfreight.com/100-amp-612v-battery-load-tester-61747.html?_br_psugg_q=battery+load+testersI bought one a while back and it really saved me lots of dollars since I got about 40 + batteries and live in a cool climate area.

Its pretty easy to pull out and do it and save you a troubleshooting headache by being able to completely eliminate that part.

before you installed it, you should have tested it on the floor with a battery and jumper cables to make sure it spins AND the bendix gear slides forward and spins also. even a 12vdc battery will do it at a slower speed.