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Old 12-21-2015, 10:29 AM   #11
FW28z
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Brand: Thor Motor Coach
Model: 2011 Four Winds 28Z
State: Michigan
Posts: 1,273
THOR #531
The classic sign of a discharged battery (not necessarily a dead or bad battery) is you can see 12V across the terminals when not being used, but drops to a much lower voltage (perhaps to zero) when applying a typical load on the battery.

A rule of thumb is Maximum Current = Minimum Voltage.

This is true whether we are discussing batteries, wiring, across a closed switch, shorts, and so on.

In other words, when a source is supplying the maximum current, it's output voltage will be minimum. In this case, the maximum current the battery can supply might only be a few mA.
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