My 2002 Buick Rendezvous won't start (even
when jumped...initially has charge till 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!
Answer:
This really sounds to me like a bad/shorted battery.
Batteries can do some strange things in your
Buick.
The fact that when the key is in the ignition you get
nothing, but when you remove it you hear allot
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
under body wiring connector getting corroded.

It is under the truck, just behind about where the
drivers seat is. The connector and harness go up to
the floorboard. This connector gets corroded inside
and can cause several electrical concerns.
2002 Buick Rendezvous Clicks When Starting

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