What is this on my graph?

[Dutch]

Wrench is correct about the voltage shown.  Unless you have been out all day and not running your engine to build the battery back up you are too low.  I try to never let my battery get below 12.4 volts.  When it does I am going for a ride.  
 

I don’t know anything about that stator stuff but you should have 12.7 volts when your battery is fully charged.

[snagged in outlet 3]

1 hour ago, fishinwrench said:

The next step down from 12.0 volts is 11.9 

Put a starter or tilt/trim load on it and you'll have 10v or less.  Have I been completely unsuccessful in teaching y'all about boat electrical circuits and the results of low voltage? 🙄 

If the motor was idling when the pic showing 12.4 was taken then he has a stator/voltage regulator issue. That can (and will) either burn up the entire ignition system....or it can start a fire without ever tripping a breaker or blowing a fuse.  

I don't have and never has electronics.  I didn't even notice the V on the graph.  What would a brand new good shape battery Voltage read on that graph?

[fishinwrench]

11 minutes ago, snagged in outlet 3 said:

I don't have and never has electronics.  I didn't even notice the V on the graph.  What would a brand new good shape battery Voltage read on that graph?

[snagged in outlet 3]

8 minutes ago, fishinwrench said:

So his battery is shot!  Same readings for deep cell??

[Dutch]

Fully charged 12 v batteries should be 12.7 volts whether cranking, deep cycle, or dual puropse. Just like the chart that wrench posted.

I am running the biggest battery that I could find, North Star X2.  It is the only one I could find that would support my electronics and hold enough charge to make it through the day even if I weren’t running live well pumps.

[snagged in outlet 3]

I just ordered a multimeter.  Thx again, guys!

[Dutch]

4 minutes ago, snagged in outlet 3 said:

I just ordered a multimeter.  Thx again, guys!

If you have flooded cell batteries, a hydrometer is a good thing to own.

[snagged in outlet 3]

12 minutes ago, Dutch said:

If you have flooded cell batteries, a hydrometer is a good thing to own.

I thought the voltmeter did that for you??  

[Dutch]

The hydrometer will show the specific gravity of each cell instead of the total battery.  

[snagged in outlet 3]

17 minutes ago, Dutch said:

The hydrometer will show the specific gravity of each cell instead of the total battery.  

I just watched a YouTube video on it.  Ordered one of those too.  Thx again