Question about Cars & Trucks
2002chevroletz71.Something is draining the battery after setting for 5-6 hours. Battery(new)starter,alternator all check good,even disconnected alternator. The truck is well equipped but everything seems to be shutting off with key in off position.
No-- it appears that something is NOT turning off or
going to sleep
Google or You Tube Video how to do a Parasitic
Current Drain Test
Remember once you close all doors, they stay closed
or your starting over
It may take a half hour before modules time out
Best you have a wiring diagram & an amp clamp or
volt meter, to put into one of the battery cables, to watch
for the drain (MilliAmps) as you remove the fuses to isolate the circuit with the problem
The alternator diodes were checked out with a scope
or checked for leakage?
Posted on Nov 21, 2014
Testimonial: "Found the problem, It is in the electric seats. Pulled fuse, truck sat all night and started this morning. Don't think it is the motor, they work fine and stay in position after setting for extended periods. Thinking maybe a bare wire maybe under carpet or the panel under the door that you step on when you get in . Thanks for everyone's help."
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Posted on Jan 02, 2017
Even though the lights work, the battery may still be just short on power to turn the motor over thus the clicking. Try charging the battery or jumping, if you still get a clicking it would be the starter solenoid. Considering the year you may just want to replace the whole starter.
Posted on May 18, 2009
does the vehicle have an anti theft device on it if so it may need to be reset. usually all you have to do is unlpug the negative batt cable. for about 5 mins.and reconnect it. if this does not solve the problem look i the owners manual to see how to override the system.
Posted on Dec 11, 2009
I suspect parasitic draw. All vehicles draw some power from the batteries when the car is shut off. Certain accessories such as clocks, radios remote door openers and alarms always need power. The normal power used is called parasitic draw.
It is always a very low draw so it doesn't run the battery down. If you install accessories like shortwave radios or plug things like inverters and portable refrigerators into the accessory socket and operate them too long without the engine running you can drain your batteries to the point where the engine won't start. If there is an electrical short in the vehicle or a malfunctioning accessory it could be drawing much more than its normal load causing a drain on the batteries. If you leave your door open and the inside lights stay on all night you could drain the battery down till the car won't start.
Here's also a good resource for your car specifically on narrowing down the cause of the drain.
Posted on Oct 23, 2012
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