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


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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

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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

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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

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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

  • 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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My Ford Ranger XLT 2013-2015 model drains the battery when i turned off the ignition key. It won't start after 3 hours.

Put an amp meatier on the battery and start pulling fuse's till you see the drain stop. Or you can go the older way and pull 50% of you're fuse's leave it the night and see you're battery is dead and just keep going till find the fuse that's draining the battery. After researching I found that it is common for the battery saver relay to fail and draw more power than regular.

Nov 13, 2017 | Ford Cars & Trucks


My car is draining battery even with ignition and light off

That means that you have a parasitic drain, that can be caused by a short or by a defective device.

First try to understand if there is a parasitic drain.

Once you exclude the drain, replace the battery, a battery with shorted cells can cause the drain.

To measure drainage remove ignition key, connect the amp meter between the battery positive wire connector and positive terminal.A couple of milliamps drainage is normal, and is caused by instruments, car stereo memory, ECU etc.
Start removing more fuses , and open the wiring at different points , trying to locate the problem.
Remove the fuses and see if you have drain by connecting a meter to read amps on battery, if you have drain with no fuse, then the problem is insulated to wiring harness before the fuse, with something shorted between the battery and the fuseblock.
Also check car stereo and car amp HU, the HU can keep a unit on when the ignition key is off, causing drainage.

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Have a short in wiring deadens batteries 2008 ram 3500

if short trace fuses if no fuses are blown test and check battery cables and connections if parasite drain then the following links will assist you
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BATT fuse dead short in 1995 yukon

You don't need to replace the fuse box , an you don't have a dead short to ground ! The fuse would blow ! You have a parasitic drain on that fuse . You need to go to free wiring diagrams an power distribution diagrams , see what all other fuse's are feed from that an pull them out one at a time till the draw stops. There are some good videos on youtube showing how to do this ! How To Perform Parasitic Draw Test EricTheCarGuy You'll need a DVOM !

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What can cause a 2008 Buick Lucerne's battery to drain so much?

If you can't see any obvious reason, like lights on, radio, etc. you have some short circuit in electric system. Get PCM (car's computer) scanned to get a diagnosis and pinpoint location of the problem.

Oct 07, 2015 | 2008 Buick Lucerne

1 Answer

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.

Aug 19, 2013 | Honda Cars & Trucks

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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

When say "dash light" I'm assuming you mean the nighttime illumination for instruments like the speedometer for example. If your truck has a stand-alone digital clock (not part of the radio) that has a feed wire from the instrument panel lights for it to dim at night, otherwise it'd be too bright. That could be a source of a short. The radio also makes use of the dash illumination as well, making the digital display darken at night and lighting the radio's controls and face plate at night, another source of a short in this circuit. Do not ever increase fuse ratings when replacing a fuse, that defeats the safety purpose of the proper fuse being able to blow, opening the circuit which prevents wires overheating and potentially catching fire. You don't want to go there. If you have recently installed another radio the wiring may be wrong. This happened a LOT on Pontiac Firebird's and TransAm's. People often wrongly assumed all black wires are ground and ended up grounding the dash illumination input. This blew the dash light fuse and made the retracting headlight doors stay up.

Jan 01, 2012 | 1987 Jeep Comanche

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Radio and center car instrument panel went out changed fuse and it blew out upon connecting

You have a dead short somewhere. Try disconnecting the radio and replacing the fuse. If the fuse blows you'll know that radio isn't the problem. Try accessing and inspecting the wiring, you may have a grounded wire somewhere.

Dec 20, 2011 | 1996 Jeep Grand Cherokee

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