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post #1 of 19 Old 02-26-2008, 09:02 PM Thread Starter
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primary battery?

in our trucks, which is the primary battery and which one to you hook up to in case you need a jump, or does it matter?

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post #2 of 19 Old 02-26-2008, 09:05 PM
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doesnt matter, ive jumped and been jumped from both no issue

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post #3 of 19 Old 02-26-2008, 09:19 PM
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yeah like stump said it doesn't matter. They are wired in parellel so what that does is double the cranking amps of the primary battery which is the drivers side if they both are charged and up to snuff so technically that would be the best one to jump from.

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post #4 of 19 Old 02-27-2008, 04:07 PM
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Originally Posted by vitalidle View Post
yeah like stump said it doesn't matter. They are wired in parellel so what that does is double the cranking amps of the primary battery which is the drivers side if they both are charged and up to snuff so technically that would be the best one to jump from.
any time your jumping you should do it from the passanger side battery. It is actually the primarey battery (the one closest to the starter will actually get the higher amp draw even though they are wired in parellel). Its also the first to recieve a charge since the wire from the Alt. hooks up to it first
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post #5 of 19 Old 02-27-2008, 04:12 PM
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Originally Posted by vitalidle View Post
yeah like stump said it doesn't matter. They are wired in parellel so what that does is double the cranking amps of the primary battery which is the drivers side if they both are charged and up to snuff so technically that would be the best one to jump from.
correct me if I am wrong but if it is in a parellel series shouldn't the started be a 24v than a 12v? if so why is our truck starters a 12volt???

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post #6 of 19 Old 02-27-2008, 04:16 PM
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Originally Posted by najaf4life View Post
correct me if I am wrong but if it is in a parellel series shouldn't the started be a 24v than a 12v? if so why is our truck starters a 12volt???
http://www.africanenergy.com/files/F...figuration.pdf

u are thinking of wiring in series
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post #7 of 19 Old 02-27-2008, 04:19 PM
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Originally Posted by Marc View Post
any time your jumping you should do it from the passanger side battery. It is actually the primarey battery (the one closest to the starter will actually get the higher amp draw even though they are wired in parellel). Its also the first to recieve a charge since the wire from the Alt. hooks up to it first
Your right Marc I don't know why I was thinking the drivers side was the primary.

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post #8 of 19 Old 02-27-2008, 04:22 PM
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okay Marc... go ahead and call me stupid......

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post #9 of 19 Old 02-27-2008, 04:32 PM
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Not to sound like a smart a$$ but it doesn't matter which battery you use. Voltage is instantaneous in a circuit. (That 2 years of college I'm still paying for is useful sometimes)

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post #10 of 19 Old 02-27-2008, 04:36 PM
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Originally Posted by whitelongbed View Post
Not to sound like a smart a$$ but it doesn't matter which battery you use. Voltage is instantaneous in a circuit. (That 2 years of college I'm still paying for is useful sometimes)
in a perfect theory yes....but add ANY resistance to a circuit and you have just reduced the effectivness of the jump start. Since the passanger side battery is four feet further away from the starter.....there is always the chance for some resistance in the circuit to effect the jump.....

So you are correct in a perfect theory but in the real world its always better to shorten the distance to make any resistance in the wires have a minimal effect on the jump....especially if the batteries are really weak...
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