Need help with electrical draw. (1 Viewer)

[EffJayAte]

According to the first picture he is measuring correctly, although the probes are reversed giving him a reading of -13.68 mA because he's measuring off the negative terminal.
It's possible that meter has internal current limiting to avoid blowing it up. I would simply take another reading with the probes reversed to be certain. If the reading is in the range of 20-30 mA of quiescent draw (everything off, doors closed) I would call that good. At that point you're just reading the clock, ECU, and radio.
IMO, a draw of over 30mA is something to be concerned with, depending on what other doo-dads you have installed.

If your battery is a typical flooded cell and it doesn't hold a charge, then it is already too late and you're not bringing it back.
There is a reason good batteries cost a little more.

The battery company had good reviews and it wasn’t cheap. Not ruling it out though.

FT965-27 Battery from Fullriver Battery

www.fullriverbattery.com

 

[EffJayAte]

Left the rig hooked up last night. Came out this morning and it fired right up. Only things I did were change out the fusible link and pull the factory amp behind the passenger speaker. 12.94v to 12.9v overnight, still seems like too much of a loss, am I wrong?

Tried measuring amperage off the positive terminal like I was told to but couldn’t get any reading.

 

[jonheld]

Left the rig hooked up last night. Came out this morning and it fired right up. Only things I did were change out the fusible link and pull the factory amp behind the passenger speaker. 12.94v to 12.9v overnight, still seems like too much of a loss, am I wrong?

Tried measuring amperage off the positive terminal like I was told to but couldn’t get any reading.

A typical automotive battery will read approx 12.7 VDC fully charged at rest.
IMO, you were measuring CURRENT correctly in the first picture you posted, but you should have had the red meter lead on the ground cable and the black meter lead on the negative battery terminal. Your original reading of -13.68 mA tells me that the meter was hooked up in reverse.
In the first picture, the meter was set up correctly to measure CURRENT. You do not show how the meter was set up in the second picture when you were measuring VOLTAGE.