I have a 1994 E320 (105k mi.) with electrical problem. It started with the low coolant lamp coming on -but dimly. Then the rear interior lights would not shut off, then when I drove it the seatbelt warning lights and thbe front interior light flashed ON & OFF. I pulled each of the door switches out and disconnected one of the wires hoping I would find a defective switch (no luck) - then the alarm began to go off. I was able to stop it by using the key but a couple days ago this ceased to help. I did find a bad connector under the battery support plate which I fixed but could not start car. Any suggestions?