wa8yxm wrote:
https://www.sony.com/electronics/support/res/manuals/4732/455f40ecf39615259f1d8a12231c8e8f/47320621M.pdf
The only OFF button I found was no the remote. But the link is for the operating manual for the product. There may also be an OFF button on the wired remote (Steering wheel) but I think the install a switch in the power lead is your best bet.. Note that this unit likely has two power leads one for MEMORY one for operation. Switch only the one with the bigger fuse.
:R
No, don't go for "the bigger fuse" or wire, that will be the one that goes to directly to the battery as unswitched. That memory lead also supplies power internally to the entire radio unit including the power amps which is why that lead is "bigger" and typically is fused with a higher amperage fuse..
Take a look at the diagram on page 28 of the manual, follow the wiring on the diagram. See the wire marked ACC with note number 3 with the red arrow I added.
Click For Full-Size Image.
On page 29 the number 3 from page 28 is explained (see the red arrow I added)
Click For Full-Size Image.
If you are going to add a manual On/Off switch then the red lead which is also marked ACC (AKA switched Accessory power or Ignition).
Do not switch the yellow wire as that will dump your memory settings and you will have to run through setup from scratch each time you want to power the unit on.
The RV builder may have spliced both yellow and red together behind the radio, just separate them, keeping the yellow directly connected to battery and add a switch to the red lead and the other side of switch to the same power connection ans the yellow lead.