2002 Ford Windstar Alternator continues to go bad

I have had to replace the alternator 3 times in the last 4 years, I replaced the battery less than 2 years ago. I replaced the windshield wiper motor 3 months ago. The van has been running kind of rough lately. Yesterday the van died, I charged the battery drove it to the parts store they tested everything. The alternator is bad the battery is bad & it is showing the starter is drawing to much electricity when starting. The windshield wiper motor is not working either. I have been told that it might be caused by a bad electrical connection. I don't know if this is true & if it is how would I locate the bad connection. I would appriciate any insights.