Help! weird electrical problems on my 300SL
 

I need help with my 1990 300SL!!!!! About a month ago I noticed that my cruise control stopped working, then a few days later I noticed that my head light flash to pass wasn't working and this past weekend my radio antenna no longer goes up or down with the rocker switch. Today I noticed that the radio doesn't go off when I turn off the ignition so I have to push the off button when I remove the key. These all may have started at the same time, i just didn't notice them all at once. I am sure they are all related.

I have checked all fuses under the hood and in the trunk. I even checked the fuse in the OVP relay. They all check out with a meter. Is there another fuse location that is hidden from view? I don't have a wireing diagram so I am unsure where to look.

Any Ideas????

Charge the bat over-nite and retry all systems..
Low voltage is the suspect..
Second suspect would be OVP or voltage regulator...

Thanks for the input. My battery and charging system are in good condition. but I don't know about the OVP. I did check the fuse on it and it was good. I am also think that I have a bad ground wire some place but it will be tough to find without a wireing schmatic. Does anyone know a source for the wireing diagram for my car? Is there a way to test the OVP? Thanks