I have a 1989 760 turvo with the stereo-cassette combination. For the past year the radio will come on sporadically. It goes off and comes on whenever it pleases. The antenna does not function when the radio is not playing. Any thoughts?
Is the radio the only thing with a mind of its own? If so, it could be a simple short in the radio power supply, maybe the amplifier mounted under the steering column. If other things are doing it also, a usual suspect is the ignition switch. I had the radio, wipers and A/C all doing it and when I replaced my ignition switch it fixed it. One way to test it is to wiggle the ignition switch, or turn it back just a hair when you start the engine, but not enough to kill the engine. Also, my electric antenna is shot, so I think I'll just put in a standard (old fashioned) hard-mounted one. G'luck
If it's basically the same radio as the '89 240, then the most likely cause is a circuit board inside the radio that plugs into an edge connector. Over years of vibration, the connection becomes weak causing the intermittent operation. I've done temp fixes on mine a couple times, but eventually it goes out again. I would suggest just replacing the radio with something newer to stop the headaches.
