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Front to Back Losing 1v


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My electrical is a d3400 up front and 2 d3100 in the back with 2 frame grounds and 2 runs of power all sky high ofc. At the front battery my dmm reads 14.5 at the back batteries it reads 13.5. How am I losing a volt? The runs and grounds go to separate batteries then I have jumpers in between. Any ideas guys?

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I could be headed in the wrong direction with this because i have no clue, but are those measurements taken with the car running or off? if running, for how long? Maybe the rear batts haven't had enough time to charge up?

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@reedal

I don't think that would be the problem because the batteries rest at 13 or so. therefore if he was reading 13.5 in back they should be charged. I may be completely wrong but just a thought.

2007 Ford Focus SES Hatchback

Pioneer HU

4 Digital Designs 9515i's in a B pillar.

2 Soundstream XXX 15K's (running at 16 volts)

Soundstream Mids/Highs in custom door panels (getting rebuilt soon)

Soundstream TA2.160 and TA2.400

Sky High and KNU wiring

3 Banks of Maxwell caps 

Winston Lithium (not a fan)

Bump4Life 250 Amp Alt. aka USAlternators

Soundstream Focus and Avenger Build Log

Instagram @p4linnovation

YouTube: Team Blowin Loud 

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I could be headed in the wrong direction with this because i have no clue, but are those measurements taken with the car running or off? if running, for how long? Maybe the rear batts haven't had enough time to charge up?

It's with the car running. I have a high out alt 270 amp it should charge up quickly when I rev the engine. Yet the voltage doesn't change after reving
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Okay checked before and after fuses. Upfront are good on both sides my back fuses are reading 13.5 on both sides though. Could it be my grounds? My runs are probably under 20ft. Its ran under the carpet and carpet padding. It is secured down under the carpet with deadner. It should not be moving so there shouldn't be any shorts anywhere.

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I would say redo or upgrade the ground and go from there.

2007 Ford Focus SES Hatchback

Pioneer HU

4 Digital Designs 9515i's in a B pillar.

2 Soundstream XXX 15K's (running at 16 volts)

Soundstream Mids/Highs in custom door panels (getting rebuilt soon)

Soundstream TA2.160 and TA2.400

Sky High and KNU wiring

3 Banks of Maxwell caps 

Winston Lithium (not a fan)

Bump4Life 250 Amp Alt. aka USAlternators

Soundstream Focus and Avenger Build Log

Instagram @p4linnovation

YouTube: Team Blowin Loud 

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You are having a 1 volt difference with no load?

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Wire has a resistance too, make sure you have a large enough gauge for the length of the run to not lose much voltage.

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Krakin's Home Dipole Project

http://www.stevemeadedesigns.com/board/topic/186153-krakins-dipole-project-new-reciever-in-rockford-science/#entry2772370

Krakin, are you some sort of mad scientist?

I would have replied earlier, but I was measuring the output of my amp with a yardstick . . .

What you hear is not the air pressure variation in itself

but what has drawn your attention

in the two streams of superimposed air pressure variations at your eardrums

An acoustic event has dimensions of Time, Tone, Loudness and Space

Everyone learns to render the 3-dimensional localization of sound based on the individual shape of their ears,

thus no formula can achieve a definite effect for every listener.

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