Okay, after not working for the past couple hours, I "think" I may have it figured out. My clock does stay current as do the FM presets, so the yellow memory wire is hooked up correctly. There must be a problem with the Sony stereo when used with the Sirius module, like the Sirius is getting power from the head-unit, but only when it is on as the yellow memory wire does not supply enough power. Thus my idea:
Check this:
http://www.docs.sony.com/release/CDXHS70MW_install.pdfI don't believe the fuse block is switched. It is always hot, when you flip a switch on the dash, it completes the circuit. The above Sony illistration shows 2 hot wires, one to the fuse block and one to the accessory position on the ignition (plus the yellow memory wire). That is where our problem is. Notice how it says if an accessory switch is not available to wire it a hot terminal? I'm going to take this wire off the ignition and attach it to an empty spot on the fuse block, which is hot, and add a fuse. This will keep the stereo on even when the key is in the off position, no more losing sound when turning off the motor! So in theory, I'm thinking that since the presets stay when pushing the power button on the stereo, this should allow the stereo enough power to "remember" the presets for both FM and Sirius instead of going dead once it loses power from the ignition.
The only downfall, if this works, is I'll have to remember to turn off the stereo when we're done for the day. Shoudn't be a problem as my last boat was like this so I'm used to it.
Wish me luck...Will let you know how it turns out.