Infinity Radio problem

From : rosco

Q: hi i have a 98 ram quad. i have a problem with the left fron speaker not working. the tweeter on the windshield column works but the door speaker is out. the strange part is that it will usually start working when it is raining out. ive had the door open and it doesnt seem the speaker is getting wet and the connections in the wiring harnesses all seem to be getting contact. would a bad amp do this it seems to me it must be a loose connection somewhere that closes when it gets moisture in it but i have no idea where it would be. i dont see anywhere that seems to get water in the system. anyone else lived through this or have a fix thanks rosco .