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Old 08-05-2006, 03:55 AM   #11
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I've jumped my semi with the PA before. You just have to let it charge for a little while.
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Old 08-05-2006, 07:05 AM   #12
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cool cuz mine has the 140amp alt. i dunno why but the rpo codes say so.
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Old 08-05-2006, 11:31 PM   #13
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Quote:
Originally Posted by willwren
It'* not about the voltage or motor size. It'* about the current in amps that your alternator produces. A motorcycle can jumpstart a big block if it charges long enough.

Let it idle-charge for about 5 minutes, then crank.

My 160 amp alternator will crank any car immediately, but a 105 amp alternator on an SE will have to charge first for a couple minutes.
I guess I didn't use the correct terms, but this is what I was talking about. Engine displacement is insignificant when jump starting... it'* all about how stout the alternator is. Thanks for the clarification.
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Old 08-05-2006, 11:58 PM   #14
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Yes, and some higher compression engines need a little more "oomph" to fire up. I've been in that quandary. (Next door neighbors high compression Chevy 502ci and putting a small battery in it.) Didn't work too well.
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