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  #1  
Old 07-24-2011, 08:00 PM
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Default Where do you run your volt meter?

Well I see it everywhere I go and everywhere I look.

I just want to know where do you run your volt meters at?

I just used a dmm to test a few cars for voltage drop and got different results which could influence where the vm is ran to not very sure.

99 taurus 1500 watt amp. full tilt 14.4v @ battery but 12.5v-12.8v @ amp.

91 ranger 700 watt amp. full tilt 13.5v @ battery and 13.3v @ amp.

2002 mustang 1000 watt amp. full tilt 13.9v @ battery and 12.5v @ amp.

I'm wondering why does the reading read higher at the batt then the amp by such a large amount? If the batt is seeing a constant 14.4v and not dropping why would the amp only be getting mid 12s? could this be a poor connection maybe or bad ground?

And the other question is where do you run your volt meter to the batt or amp pos/neg? I've always ran mine to the batt thinking that whatever my batt was reading was what the amp was seeing and it appears I've been wrong for a while.. oh the joys of being a newbie.
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Old 07-24-2011, 08:04 PM
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I ran a set of wires to the bass amp and have it in the power input terminals, then put the voltmeter in the dash. This will give you the most accurate reading for your voltage drop.
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Old 07-24-2011, 08:07 PM
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its because of the distance or how much wire [length wise ] is between the battery and the amp .the longer the wire the more voltage you lose.thats why we run multiple runs of wire
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Old 07-24-2011, 08:07 PM
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1-2v lost in small vehicle like those shouldn't be normal. Inferior wiring or bad ground maybe?


@amp when my sub amp is in, right now it is just at battery though.
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Old 07-24-2011, 08:10 PM
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Ahh I see. I always ran to the batt thinking the amp would be seeing the same as the batt so when my batt was reading 12v does this mean the amp was most likely even lower then that? :x not good.. and a mistake I won't make again most likely if thats accurate lol.
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Old 07-24-2011, 08:12 PM
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I think you answered your own question

amp power terminals is best
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Old 07-24-2011, 08:16 PM
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Quote:
Originally Posted by 18inchjeepin View Post
I think you answered your own question

amp power terminals is best
Lol yup leave the batt connections for big 3 and amp wire. Just less wires under the hood to fiddle with and possibly a slightly cleaner install as well.

Thanks guys.
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Old 07-24-2011, 08:17 PM
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voltmeter should be placed at the amp's terminals.

also, there should be NO drop in voltage from the alt's post to the amp's terminals unless the install is knowingly handicapped due to limits\restraints of some kind.

Running full ground straps from bumper to bumper is typical to prevent voltage drop.
Any other reason that would be causing voltage drop from front to back is due to either poor connections or poor choice in wiring size\quantity.
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Old 07-24-2011, 08:20 PM
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I did mine at the rear battery bank.
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Old 07-24-2011, 08:32 PM
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I'm going to run mine directly to the amp's terminals. I was messing around in my last car before i had done the big three and observed a huge difference in voltage from the battery to the amp terminals. The difference was about 2 volts.

I would be staying around 13-14 volts at the battery and dropping down around 11 volts at the amp. I think that it is extremely important to measure your voltage at the amp's terminals because that's what matters.
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