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slow to crank, can be corrosion build up on the starter terminal, 90 seconds with a shifter to undo it, a brush, and some wd40 after its done back up head slap moment:: that can/may be the problem with the alternator a 12 volt 50amp circuit must have less than 0.24 ohm to get 50 amps e=IR...

the free test from an autoelex will usually test both voltage and current output, if the alternator fails either, repair or replace

portable alternator 'testers' test voltage levels, and are useless an alternator tester is huge, runs around the shop on a trolley and includes loads the alternator is polyphase, when 1 phase fails, it becomes a return path for the other 2 phases the generated voltage still indicates 14.7, but...