I installed an aftermarket radio that intermittently shuts down but I discovered that if I slightly lower the right rear power window it always comes back on. Useful to know but I don't understand what's going on. This 1991 740 turbo wagon sat in a warehouse for over a year after installing the radio. My mechanic just installed a new timing belt and internal fuel pump and it's now back on the road. But the radio thing plus the ABS light always on and the brake dashboard trouble light lighting up whenever I hit the brakes have me worried. Any ideas?