Radio, wiring and power question. HELP.

[Premium72]

so ive hooked up my radio and i got no power out of the plug in the fuse block with the arrow pointing from the radio fuse. the fuse is good, i checked the fuse holder with the meter and im gettn 12v at the top and somthing really low(i forget rite off hand) at the bottom post (this is with out the fuse in and key on.) so for now i have it in one of the "extra" plugs just to the right of the radio. so everything works fine this way. but when the key is off i've got no memory power. I lose all my settings and what not. anyone have any ideas? thanx in advance. w.