BCM problems on a 1996 voyager

I've been having BCM (body control module) problems with my '96 Voyager for over a month.

It started in early August. Took it to the dealer, which replaced the original BCM for a new one for about $1500.

Within a week after the replacement, my gas gauge failed. Took it back to the dealer where the mechanic said the BCM they just put in a week earlier was faulty. Dealer replaced it (again) at no charge.

However, when I picked up the car the windshield wipers were no longer working. Again, back to the dealer where the mechanic says the BCM he installed just five days ago is faulty. What's more, when I asked if there was anything in the car (wiring, other electrical problems, etc...) that might be causing problems for the BCM, I'm told no, just that the BCM needs to be replaced.

This will be the third BCM installed in my 1996 Voyager within the last 30 days. Does this happen a lot? Is the mechanic screwing up the installation? Or should I be looking for something else in the van (despite what the mechanic said), that might be causing problems with the BCM?

I also have a '96, and I'm running fairly dependably now on my second BCM. My original failure was the windshield wipers. There are problems with vehicle ground points under the hood and elsewhere. The one I've had the most trouble with is on the drivers side beneath the battery box. There are two large wiring harness connectors in the area that may obscure the ground point which is on the wheel well. There is a drain on the bottom of the battery box that you would be well advised to put a length of hose on to direct anything that drains from the battery away from the electrical connections and the grounding point. Clean all the grounding points you can find, coat with spark plug boot lubricant or dielectric grease, and tighten the connection really good. MB