yugo82

I have a 1999 c200 wagon, parked for about 3 months. tried to use it a few weeks ago, but noticed the navigating lights, wiper, horn and windows were not responding plus sometimes my key fails to turn the ignitions. when I removed the positive battery terminal and replaced they all come back to working fine but if for any reason the terminal is removed temporarily, the whole thing is messed up again. I had it running fine after removing and replacing the
+ve terminal for about a week and then had to park again cos I was out of town for 3 days, now the keys wouldn't turn my ignition, nothing works even the door ajar lights don't turn on with the door open and my battery terminal trick don't work anymore. Can somebody please help.