Join Date: Aug 2009
Location: Lakewood, Colorado, USA
Model: '06 GL1800
On that #13 fuse (the 5A "Backup" fuse that you mention in your original post) -- that should also hold the clock's time and radio station preset. -- if the station's stay in memory over night and the clock is holding time well enough, then the #13 fuse is NOT the issue.
Sadly, if the clock and station memories items ARE functioning, and the output amps are still not driving and the cassette eject is not ejecting (eject is electronic only on the later year bikes, older 1500's have mechanical eject mechanisms), then this woudl show that 12V from the Backup fuse are indeed reaching the radio (on that Yellow wire with red-stripe there at outside squareed-corner of the long connector).
When you removed the CB, did you pull the harness connection out of the radio as well (the "middle" sized plug of the three that are on the SE radios)? -- if that's removed, then you can discount any odd behaviors (there'll be no need for any of those connections without the CB anyway, so if it's not unplugged, unplug it)
If there's a 'false mute' signal coming through the handelbar mute switch -- the "MUTE" indicator would darken on the LCD, so that's a good thing to check (assuming no - since you've stated)
The Radio outpu will also mute whenever you press the starter button (for start or for reverse), no idictor or anything, BUT generally ifthis is "stuck on" you'd have solenoid "A" pulled in or your bike wouldn't be able to start (so if you can start, and the starter motor does not run on .. this this isn't the Mute condition -- )
ACan you adjust the air in your shocks OK (with the air pump, incerease and decrease pressure in the shock and see this on the display) - if so then the ACC fuse (#10, 10A not the little 5A in the #1 spot) is also happy.
Does the backlighting for the radio come on when you turn on the radio?
How does it play in your headset? (uses the same power source as the power amps, but would eliminate speaker/fader related issues)
Since the power amps and eject (later models) mechanism share a power source... At that point, barring a loose connector/plug, or other symptom I would suspect that you may have chrome knobs? or internal issues in the radio itself.