early 90s omc triple,

on the terminal block

top wire is yellow
2nd wire is yellow w/ grey
3rd wire is grey
etc...

top wire is yellow shows 7 volts on meter when key is off
2nd wire is yellow w/ grey shows 7 volts on meter when key is off


top wire is yellow shows 7 volts on meter when key is on
2nd wire is yellow w/ grey shows 7 volts on meter when key is on

question?
why does these wires show voltage when key is off?

why does these wires only show 7 volts when it should read 12 volts(or current battery voltage)?

I tested my battery and it is putting out full 12 volts, even shows that on the other terminal wires.

thanks in advance for any help