Well I went through the entire interior and unplugged and replugged most of the electrical connections. It wasn't the radio but it was something else. It is no longer happening but I do get an audible click from the door courtesy lighting system which is kind of flaky to begin with. So I think either it was a corroded plug somewhere or it is the interior lighting and it just hasn't happened again yet. Now to adjust the valves and change the oil and then this 85 300CD is being sold.
Thanks Again

Where are you at? price?

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'83 240D (for sale)
'84 Harley FXRT
'85 300CD Turbo (Sold)
'85 500SEC (for sale)
'04 Dodge Dakota Quad
'06 Harley FLHTCI
'97 SL320

Not too sure about the price. 135K miles, new tires, shocks, floor mats.. uh, white with euro lights, California model. I should write down everything I can think of about it cause I am drawing a blank now. There is some fading on the top of the rear seat and a little dent on the passenger door trim line. I was thinking NADA average retail but what that siemensrudy guy is getting for worse (recent one) on ebay makes me think that is too little. I would buy it if I could afford it but I do have a 124 300TD I like and want to keep in top shape. I haven't tested the market here yet.