POS connection for DC distribution panel - SailNet Community

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  #1  
Old 07-28-2007
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POS connection for DC distribution panel

Sorry to address this point yet again, but I just want to be clear on this. From reading many of the posts about DC wiring, I've gathered that the POS wire to the DC distribution panel should run directly from the common terminal of the battery switch to the POS bus on the DC panel.

I ask for clarification because in my boat the POS lead comes from the same lead as the ammeter's connection to the POS terminal on the starter solenoid. The ammeter doesn't work, BTW, though the panel is getting its power.

Still, I thought that looked like the wrong place from which to feed the distribution panel, while the direct connection to the common battery switch connection sounds a lot more logical.

Thanks for any info!
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Old 07-28-2007
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Though not an electrician, it is my understanding that your ammeter should be wired into your NEG side, through a shunt, then to the meter, not POS. The DC POS to your DC panel, should come from your common terminal on the battery selector switch. I would use at least 8ga wire for your POS lead to the panel.

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Old 07-28-2007
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That's why your ammeter isn't working. The load is not passing through the meter.

Check out these two links.

http://www.6066gmcguy.org/ammeter.htm

http://www.caigauge.com/ammeterfit.htm

The POS terminal that feeds power to everything else is usually attached to the same terminal on the starter solenoid that the POS battery cable is attached to. I don't know why this is common. Older Chevy vehicles are like this as well.
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