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.
__________________
The only thing that works on a RV is the owner...
|