2008 ProV 1800 fuse panel question

[Pat]

Here's some photos of my panel. Are all the spade and screw connection on the back of the panel ground connections? All wires going to the spade bar are black.

Edit:. Silly additional question. I used to have a short beeping sound when I would turn off the "main power" switch on the dash. Noticed recently that this beeping doesn't occur when I switch off. Where would that "beeper" likely be located?

[Plotman]

I cannot answer your first question however, mine gives several series of beeps when the master power switch is shut off which is from the stereo powering down even though I actually wasnt listening to it. If I "shut off" the stereo, no beeping when master power is switched off.

[ozarkeyes]

The spade connectors are the ground (black is ground for 12 volt marine systems) The other block with screw connectors are positive (red wires- including various other colors to the various accessories may have red stripe like yellow/red stripe, brown/red stripe)