Bought this sweet little 1990 Conv C4 and have been blessed with odd electrical problems from day one. Sometimes the radio works, sometimes, not so much. Sometimes the interior lights flash on and off, and when I turn the steering wheel at a hard angle, the horn sounds. At times, when driving, the horn sounds all by itself for apparently no reason. I'm not getting any error lights appearing except for the quintessential air bag light and the occasional check engine light. The dashboard lights work fine, as does the digital speedo and other digital readouts.
I'm convinced it's a ground problem(s), and I'm already replacing the door switches and horn relay. Any other advice for these symptoms?