Voltage drop..

[djr4x4]

Here's a lil bit of info.. I have a 2008 Ford f250 diesel. Dual batteries, stock alt.. I just wired up the elemental design nine.1 amp and at full tilt at idle I've noticed my voltage dropping from 14.10 down to 12.8.. I plan on doing the big 3.. Will that alone be enough?

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[JoshC 10+ year member]

Here's a lil bit of info.. I have a 2008 Ford f250 diesel. Dual batteries, stock alt.. I just wired up the elemental design nine.1 amp and at full tilt at idle I've noticed my voltage dropping from 14.10 down to 12.8.. I plan on doing the big 3.. Will that alone be enough?
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What kind of battery's?

12.8V isnt very low, do you plan on adding more power?

 

[Umbra]

Here's a lil bit of info.. I have a 2008 Ford f250 diesel. Dual batteries, stock alt.. I just wired up the elemental design nine.1 amp and at full tilt at idle I've noticed my voltage dropping from 14.10 down to 12.8.. I plan on doing the big 3.. Will that alone be enough?
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That should fix it. That amp does 1200W @ 1 ohm, right? I don't know the amperage of the alt, but I'm guessing something in the 110A-140A range. With proper wiring that amperage should be able to sustain that unless a diesel trunk uses substantially more power than a gas car while idling.
How's your ground?

 

[djr4x4]

I'd have to recheck on the batteries in there.. Itll make my headlights dim at night which is annoying... If I add anymore power it would be a second amp for the highs...

The amp does 1200 @ 1 ohm @ 12.5 volts I believe it was.. I'm running it at 1 ohm... I almost certain oem alt on my truck is 130...

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[dev199505]

I'd have to recheck on the batteries in there.. Itll make my headlights dim at night which is annoying... If I add anymore power it would be a second amp for the highs...
The amp does 1200 @ 1 ohm @ 12.5 volts I believe it was.. I'm running it at 1 ohm... I almost certain oem alt on my truck is 130...

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Big3 and replace both batteries with AGM or maybe just new regular batteries should be fine

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[wew lad 5,000+ posts]

nine.1's are nice amps, but as you can tell not very efficient lol

getting 1/0 OFC from your alt, to batts, to sub amp will give you an improvement, as will adding more grounds from chassis/frame/engine/alternator to battery