Dear BL: My 2002 Buick Rendezvous won't start (even when
jumped...initially has charge til battery drained).
Sometimes I put the key in, nothing happens.  I remove the key, and you
can hear relays going wild and gauges go in opposite direction.  Is
this an electrical short or bad Control Module or relay or something
else?  Thanks much!






BL:
This really sounds to me like a bad/shorted battery. Batteries can do some
strange things. The fact that when the key is in the ignition you get nothing, but
when you remove it you hear alot going on is probably because of a low system
voltage condition. Modules, relays, switches on todays cars dont like a low voltage
situation and cause them to act very odd. First check the battery connections are
clean and tight. There is also a service bulletin about an underbody wiring
connector getting corroded. It is under the truck, just behind about where the dr.
seat is. The connector and harness go up to the floorboard. This connector gets
corroded inside and can cause several electrical concerns.
     
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Buick Rendezvous won't Start