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Old 03-23-2004, 20:59   #1 (permalink)
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Battery Help?

Ok guys,

Just had a big drama with my old battery (wouldnt start and played up etc) so I bought a new battery. Now, I've had it in the car since last night and have driven about 150Ks since then. I just went out to check the voltage of the battery, and with my good multimeter it showed 12.7 across the terminals with the car off, and 14.67 with the car off... Is that normal?? I've noticed that the car is really low on revs as soon as you start it up (almost to the point of stalling) but picks up a little while after...

Is my alternator stuffed? How to i test the alternator? Any help would be appreciated guys, the last thing i wanna do is stuff my brand new battery
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Old 03-23-2004, 21:52   #2 (permalink)
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Re: Battery Help?

Well with the car running, it should read 14.5 volts or there abouts at idel, with no lights etc on, as long as the battery voltage does not drop below 12.5 you will be just holding your own and no damage done.

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Old 03-24-2004, 14:32   #3 (permalink)
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Re: Battery Help?

Hrm, I will check it again when I get a chance, but I've been told that my Alternator might be ratshit.... In that case, I was told by the autoelec that the EA's came out with either a Bosch or Mitsubishi Alternator, and a Bosch is $150 changeover, and he didnt give me a price on the Mitsubishi one (apparently they are a lot more expensive) How do I tell which alternator I have? Does anyone have pictures of both alternators? I just wanna do this right the first time so any help would be ace!
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Old 03-24-2004, 14:34   #4 (permalink)
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Re: Battery Help?

the bosch are huge and the housing is not fluted

Besides it has the 3 diamonds stamped on the mitsubishi ones
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Old 03-24-2004, 14:36   #5 (permalink)
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Re: Battery Help?

Fluted? what do you mean?


Also, where would the logo be? On the back?
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Old 03-24-2004, 14:46   #6 (permalink)
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Re: Battery Help?

fluted as in the housing is not solid,, the bosch only has vents at the back but the mitsubishi one is fluted (vented) on the sides of the housing

Yes the logo is on the back
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Old 03-24-2004, 14:52   #7 (permalink)
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Re: Battery Help?

ok just checked it out, it isnt venting out the sides, just the back... the sides have a little "bump" in them tho... but the bumps are solid, as in there are no vents in them....

crap i wish i brought my camera to work today
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Old 03-24-2004, 18:29   #8 (permalink)
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Re: Battery Help?

the bosch alternator has an external voltage regulator, not much can go wrong with alternators. Check your diode pack and regulator bushes. I would say if it is charging up to 14.5 V on idle then it is ok. To check it put some load across battery(eq turn lights on high beam while running car, voltage should drop 1volt then rev engine to 1500rpm and the alternator should bring the voltage back up to 14.5V). If it doesn't do this then you have dropped a diode. Generally if regulator goes the battery light comes on while driving.

cheers JJJ

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Old 03-24-2004, 18:54   #9 (permalink)
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Re: Battery Help?

Just went out and picked up the new one :)

The old one is up the sh1t, so I may aswell get a new one and start again :)
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