S2000 Under The Hood S2000 Technical and Mechanical discussions.

alternator wont charge the battery

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Old Aug 29, 2012 | 05:09 PM
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Default alternator wont charge the battery

ok so here is the background to the story, my DD had a bad positive battery cable, it was rutted out, i didnt know this at the time that i tred to use my S to jump it off. well on the way home after a unsuccessfully trying to jump off my dd my S started to loose power, radio went off and the power steering went out. went to auto part store and they tested for the amps from the alternator it gave 10.3, so i biught a used oned that the seller claimed it worked and after installing it drove down the road and the same thing, no radio no powersteering after a while. so i bite the bullet and got a new one today,installed it and with in minutes same thing, made it to the parts store down the road and the brand new alternator said the same thing as the original one 10.2-10.3.


im going back to the part store tomorrow with all 3 to bench test them, but i was wondering if anyone has gone through this before and also if by some weird reason all 3 test out fine what else could it be? the battery is brand new OEM and the car never had this issue before until that day when i tryed to jump my DD with the rutted out positive battery cable.

once again if you didnt get to read all of it because you might be lazy.

original alternator read; 10.3 amps

new alternator read; 10.3 amops

and the battery is brand new OEM
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Old Aug 30, 2012 | 08:03 AM
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Well what is the alternator supposed to read amp wise? is 10.3 good or bad?

Start by checking all fuses. You may have burnt one up trying to jump your DD.

Also what does "rutted out" mean? Rusted? corroded? Broken?
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Old Aug 30, 2012 | 08:11 AM
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corroded and im thinking fuse also, does any one know what fuse is the one for the alternator?
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Old Aug 30, 2012 | 09:15 AM
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Originally Posted by yumad
corroded and im thinking fuse also, does any one know what fuse is the one for the alternator?
There is a label on both fuse boxes
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Old Aug 30, 2012 | 09:21 AM
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Have battery load tested. I had a brand new oem battery go to crap on me only owning it for a month
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Old Aug 30, 2012 | 10:52 AM
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This^^
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Old Aug 30, 2012 | 11:08 AM
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Originally Posted by jordanksartell
This^^
the oem baterry was working just fine before me trying to jump off my DD
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Old Aug 30, 2012 | 11:18 AM
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Originally Posted by yumad
Originally Posted by jordanksartell' timestamp='1346352758' post='21976736
This^^
the oem baterry was working just fine before me trying to jump off my DD
Take it to advance auto parts, free alternator, battery testing etc
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Old Aug 30, 2012 | 11:27 AM
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yeah im taking all 3 altenators and the battery today after work
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Old Aug 30, 2012 | 11:30 AM
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Originally Posted by yumad
Originally Posted by jordanksartell' timestamp='1346352758' post='21976736
This^^
the oem baterry was working just fine before me trying to jump off my DD
It may be just a coincidence that it went bad at the same time you tried to jump it. Best is to have them tested like everyone is saying.


Here is an example of coincidence.

Friend of my dads had a nice lawn mower, one day he hit a rock.
It stopped working.
He gave it to my dad for free.
It had ran out of gas when he hit that rock.
we put gas in it, worked like a charm.
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