I had accidentally connected jumper cables backwards to my motorcycle for a brief moment. After getting the battery properly charged, the bike still started & ran fine, except none of the audio components worked (radio, CB), clock & trip meter stopped worked, nothing that required memory would work.
While the damage could have been in any of those units, the most likely would be a damage audio unit, which is very expensive. But thanks to generously help from people in the http://gl1800riders.com/forums/index.php message boards, I was able to repair the audio unit with a new 90 cent diode myself. Attached is some photos of the repair. I didn't take a photo with the damage diode still on the circuit board, but it is shown after being removed.

A.0740.audio.unit

A.0740.audio.unit

B.0734.audio.unit

B.0734.audio.unit

C.0727.audio.unit

C.0727.audio.unit

D.0731.audio.unit

D.0731.audio.unit

E.0732.audio.unit

E.0732.audio.unit

F.0708.audio.unit.diode.points

F.0708.audio.unit.diode.points

G.0706.audio.unit.diode.missing

G.0706.audio.unit.diode.missing

H.0710.audio.unit.back.side

H.0710.audio.unit.back.side

I.0713.audio.unit

I.0713.audio.unit

J.0717.audio.unit

J.0717.audio.unit

K.0725.audio.unit

K.0725.audio.unit

L.0729.audio.unit

L.0729.audio.unit

M.0721.audio.unit

M.0721.audio.unit

N.0728.audio.unit

N.0728.audio.unit