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Old 09-16-2012, 02:32 PM
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Default Severe Voltage Drops

Ok so I finally got my voltage meter installed and WOW. I have some hefty voltage drops, let me point them out.
1. Volume 0, car idle, voltage drops slowly ( watched go down to 12 from 14 )
2. I don't know if this is the same for everyone, but braking causes a 14.6v to go to 12.5v WTF
3.Well from #1 I can say that I do not listen to music idling cause I will hit below 13v instantly.
4. Obviously idle sucks so as long as I'm around 2k+ rpms voltage drops around .5v at full tilt. Which I feel is still bad.

My best idea ( only cause it's a cheap fix ) is that I don't have a ground running off my alternator because I was told it is already grounded to the frame of my car as is. That's my only guess.

Help?
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Old 09-16-2012, 02:34 PM
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sounds like your alt does almost nothing at idle?
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Old 09-16-2012, 02:39 PM
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If this was the case, is it somewhat broken? or just not powerful at idle? I'm looking into some better ones but need to make it for at least 2 months on this one
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Old 09-16-2012, 03:06 PM
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take the alt out and have it tested at autozone. Either something with the alt is messed up or you have a big wire issue.
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Old 09-16-2012, 03:12 PM
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Is it an aftermarket alternator? If so, they put too large of a pulley on it.
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Old 09-16-2012, 03:19 PM
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A ground to the alt would also help with drop too.

And .5 drop is nothing man. Don't be concerned with that.

It could be too big of a pulley or your belt could be slipping.
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Old 09-16-2012, 03:49 PM
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Quote:
Originally Posted by SINTORMAN View Post
A ground to the alt would also help with drop too.

And .5 drop is nothing man. Don't be concerned with that.

It could be too big of a pulley or your belt could be slipping.
i gained .1 of a volt JUST by grounding the alternator..just use a mounting bolt and ground it to a strut tower or something and ALWAYS paint over the grounds so they dont corrode down the road..
and going from 14.4s dropping down to 13.9 14v flat is NOTHING to wrry about nothing at all
sounds like to me you have a weak stock alt and maybe the battery underhood is starting to get weak
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Old 09-16-2012, 03:51 PM
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Quote:
Originally Posted by xnewbx View Post

My best idea ( only cause it's a cheap fix ) is that I don't have a ground running off my alternator because I was told it is already grounded to the frame of my car as is. That's my only guess.

Help?
the motor and trans is mounted in RUBBER mounts the motor touches nothing solid..besides the metal block itssef
i always ground my alt (like i said just use a mounting bolt and ground it to a strut tower or something..some say ground to the battery which only has basically grounding point as is)
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Old 09-16-2012, 03:52 PM
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if you can get above 13.0v above idle then i wouldn't be worrying about wiring too much.

Although you do need a ground directly off your alternator to your front battery for the big 3. My big 3 suggestion is 2 1/0 from alt ground/mount location. one going to chassis ground and one going to front battery.

you could try swapping to a smaller pulley and see if that helps.
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Old 09-16-2012, 04:15 PM
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Before you get into 1/0 big three and whatnot... What amp are you running? Anything over 12v is fine.
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