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post #2 of (permalink) Old 07-09-2018, 03:20 PM
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Join Date: Jun 2010
Location: Olympia, Washington, USA
Posts: 2,163
Old school rule of thumb is 20-25 amps per hole. Four cylinder should be right around 100 amps. I dug out my old VAT40, cleaned the leads so I could tell which was Positive.......My 1200 @12.3 volts cranks @ 95 Amps, dropping the voltage to 10.2. It spins normally. However, my battery has no capacity, so when the voltage drops to @ 10.5 volts, it pulls 126 amps and drags the battery down to 4. I think the rule of thumb applies. I have an '85 on the charger and will test it later and post. I don't expect anything different.

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