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Re: 1993 Chevy van battery shorted
To be honest, I googled it up one day, and I can't remember from where it came. I have the pdf (complete with the author's name and all the advertising) and I have shared it. I should really look into posting it, or at least dig up the original link. The DRAC module was typically used on GM vehicles from about 1990 to about 1995 or so (rear-wheel drives), so it doesn't necessarily apply to all applications.
My troubles began during the first rain after purchasing the van (it had 196k miles already, so it was no spring chicken). The speedometer became erratic and the transmission quit shifting. The VSS circuit code kept coming up, so we began a *long* series of replacing speed sensors, connectors, the computer, etc., believing that the rain was causing a short underneath the van. It would go away for a while then come back (usually during a good rain). Finally one night the speedometer quit dead (and the transmission quit shifting). It was during this time that I stumbled upon the article about the DRAC module. I have had no problems since I replaced it. I now believe that it kept going haywire during rainy driving because I had a leak at the bottom of the windshield that was causing water to leak back behind the dashboard along the firewall, and that it would find its way into the DRAC module and short it out. I had already replaced the windshield and gasket before the thing quit altogether, so hopefully this won't come up again.
I drove two different transmission shops batty trying to resolve the problem before finding about the DRAC module (I guess most people don't even know that it exists (well, existed), dealer mechanics included). I suppose that there are probably other similar modules that are hidden away in vehicles that people don't know about and that cause a bunch of problems like this.
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