Ford: 1990 Ford Econoline Van - Electrical Problems, ford econoline van, ford econoline

Question
I have a 1990 Ford Econoline Van 351.  We have been having major problems.  about 3 months ago I changed out the alternator, voltage regulator, starter, cylinoid....our electric windows quit rolling up or down...our head lights went out. Now we're back to square one again...I just had to change the cylinoid again, and am now on the second alternator, and another battery.  Please help.

Answer
OK no problem you need to be checking the grounds not the power.If you look at the neg. side of the battery you should have 3 grounds first ,batt. to body and make sure that the surface is not rusty.then body to eng. then if you look at the batt. ground you will see a 12 gauge wire going to a conector make sure they r not burned.Clean both ends replace if they r in poor condition.