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If they are truly in parallel, there should be no difference. They are both are used to turn the starter and should be balanced, or one will die before the other. The same is true for charging.
Besides, with a diesel truck, the alternator is usually an extra heavy duty. I doubt you will be pulling current from anything except the alternator. Most battery cables should be used to CHARGE a battery, not try to start a car.
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James
The pessimist complains about the wind; the optimist expects it to change; the engineer adjusts the sails.- William Arthur Ward (1921-1994)
Red-beard for President, 2020
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