Question about 2002 Chevrolet Avalanche

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Parasitic drain in my truck

To make a long story short a had a after market radio installed in after a while it stopped plus blew my instrument fuses inside light hood light and head light switch. Once putting back my factory head unit speakers on the left side didn't work and that's when I notice I had a drain on my battery it would go dead every 4 or 5 hours. After taking it to the radio installer and telling him he said it was the factory amp so he put a bypass thing on there and the speakers started playing instantly. So I thought nothing else of it. After a while I realized that the drain was still there just not as bad if I left the door open for ten min. Battery dead if I cut the truck and say left the a/c or wind shield wipers in the on position battery dead, if I went to the truck and open the door 4 or 5 times without cranking it up it would not crank when it was time for me to go home from work. I just don't know what it is and don't want to spend a lot on repairs if it's something simple.

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  • Chevrolet Master
  • 3,828 Answers

Either remove the battery terminals each stopping point
until you check starter and ignition and alternator

if the parasitic drain started straight after the radio install
return to that after market installer
and get them to explain why

Posted on Mar 07, 2017


6 Suggested Answers


6ya staff

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Posted on Jan 02, 2017


Daniel Arellano

  • 962 Answers

SOURCE: 2000 Chevy s10 starting problem

Check the ignition and Engine relay switches located under the hood. Sometimes relays go weak with age and even a bump on the road will shut them off. If you can turn the truck on, take it to Autozone or similar store for a free DTC scan code.

Posted on Jan 09, 2009


  • 39 Answers

SOURCE: Factory Stereo Drains Battery

I have had this problem with a few of my cars and I thought the same that my battery was gettin drained by the stereo but really my battery was going bad hich resulted in the radio staying on for some odd reason, but i replaced the battery and all is good with no more problems, so I would take my battery down and have it tested.

Posted on Jan 31, 2009


David Penman

  • 255 Answers

SOURCE: 1987 Chevy R10 project truck won't start

check the float on the carb is stuck shut not letting fuel in

Posted on Aug 17, 2009


  • 2 Answers

SOURCE: 2005 Colorado drivers side window and remote locking system

Just figured it out and replicated it 3 times..

any type of power/voltage change seems to trigger this issue

The most common symptom is power locks fail and only the driver window quits, however that is on the extended cab.

Steps to fix and it works every time.

take door panel off driver's door
Disconnect the wiring attached to window and power lock control unit
disconnect battery cables
connect the negative to the positive cable(((NO BATTERY CONNECTED)))
This will act to short residual voltage in the system

5 minutes later
place the key in the ignition and turn to the run position
connect the wiring to the window/lock controller
connect the negative cable to the battery
then the positive
open drivers side door
turn key to the off position((do not remove yet)) you should get a series of dings through speakers telling you the key is still in the ignition
once it begins dinging pull the key out and you should hear the door lock solenoids trigger and the windows should work.

Three years and a very unhappy girlfriend who owns the truck. but she's happy now.

Posted on Mar 24, 2010

Bruce Hathcock

  • 3600 Answers

SOURCE: 2007 hhr. Battery was drained. Mother left lights

your alarm system has been tripped when the battery went dead, to get the information on how to reset the alarm is to call the car manufacture to get the procedure, and should not cost you anything.

Posted on Jun 23, 2010

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1999. Why does the 15 amp IOD fuse keep blowing?

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you do know they can kill right? why do that.
the FSM has warning on every page for that. heed it.
why not now, get the car serviced for bags and make it safe.
but first check all fues, my guess, wild, is you blew the fuse.
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you blew a fuse. check fuses in both fuse boxes..
ahh yes, the IP cluster lamps are dad, but not the idiot warning lights
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my guess three is a short on the TAIL fuse, the TAIL fuse blew
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Bought frontal crashed honda crv 52 plate, put new battery, no power, checked the inertia switch, found 100 amp fuse blown, replaced it, but blew straight away. no power to anything except the abs pump.

52 plate?
blew keyon, or key off, drumming fingers now..... straight = key off?
you do have a big short. and saved the fire.
so what is it, the FSM shows you all loads on that fuse.
so does the schematics at look. we do every day.
no years stated, so i can not look,

the 100a might be a shorted, alternator, but id bet its the harness. (crash)

what we do in a real shop is use 2 cheap tools to find all shorts.
Hard one>/
we use a DC battery charger, True DC not pulsing DC, quality !!
then with my DC amp camp meter,
I do this.
i disconnect the battery and put in a fuse bypass, 100amp. (jumper wire with 30amp fuse inline, like all FSM say to do)
i next attach my charger, minus to minus and plus to plus (tender care on polarity)
then i turn the amps know my fancy charger to say 10 amps.
an nice safe quantity.
i have current flowing now and then, use my amp clamp
on all wires on the main fuse box to find what line is shorted.
it shows 10amps to alt.
i unplug the ALT and bam, no more short.

that is how i do it.
ive found vast numbers of shorts in many systems.
car, , ships, trains , and other complex systems.
deep in to place , nobody ever goes.. some wild stories.
sea story:
on one ship , i found a short in a huge compartment on a CVA . (63? i forget now , 1973?)
that was not even documented,, later the crew fought over this space.
funny stuff, (no one could find it, but I had a TDR tester and that is
really a wire RADAR, finds the exact distance to the short)
to a 10th of a meter. tool.
this system was emergency radio.

any good DC power variable supply works here, use any with an
AMPS knob......
i post this to stop guessing and to save the cost for 100amp fuses
can cost more than the tools.

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I have a 87 jeep comanche. auto. transfered to 4x4. my dash light wont work, i believe its a dead short because i raised the fuse number and it still blew. my question is, were would be the most likel

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