Question about 2001 GMC Denali
This car has had an intermittent dead battery issue - sometimes after sitting for 1 day and sometime after sitting for three + weeks. The battery voltage today measured 12.62 but failed to crank / start. Since there has been no real pattern, today I decided to perform a current draw test with my DVM. With no key in the ignition, doors closed and lights out and my meter in series with the negative terminal I measured close to a 2 amp draw!. I popped each fuse, and relay out and found the draw dropped to ~170 mA when the 15 amp fuse for the radio was pulled. With the fuse removed the meter indicated the residual draw fluxuated from 90 mA to 200 mA. I am charging the battery, will have a battery load test performed tomorrow as will rerun the draw test after the car sits 20 minutes to ensure all the "modules" are asleep. Clearly w/ a 2 amp draw this could be the source of the problem. My question is what else does this circut feed or is this a symptom of a fault in the radio/CD/Amp (Bose sound) or Onstar. (nothing is currently wrong with the audio system) The other strange observation is sometime the rear window wiper jumps from the parked position when battery power is restored (no change in the draw was observed when the fuse was lifted). This car has all the goodies - steering mounted audio controls, courtesy **** and remove keyless entry.... I really dont want to crack the dash open until I have an action plan. PS - this has been to the dealer before and of course they could not find anything wrong - I am sure they did not do a parasitic draw test..
The wiper should not move regardless of battery change as the wiper switch should have isolated it.It seems to be the only ,as you say,strange thing and would be inclined to believe that that is the probable cause of your fault.Do like your testing method and hope you track the fault down.Good luck and happy new year.
Posted on Dec 29, 2008
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