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Posted on Mar 07, 2017
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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
  • Posted on Mar 07, 2017
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Joined: Aug 29, 2014
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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

5 Related Answers

Anonymous

  • 962 Answers
  • Posted on Jan 09, 2009

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.

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Anonymous

  • 39 Answers
  • Posted on Jan 31, 2009

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.

Anonymous

  • 255 Answers
  • Posted on Aug 17, 2009

SOURCE: 1987 Chevy R10 project truck won't start

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

Anonymous

  • 2 Answers
  • Posted on Mar 24, 2010

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.

Anonymous

  • 3600 Answers
  • Posted on Jun 23, 2010

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.

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2008 Land Rover battery keeps dieing. Change battery, change alternator

If it dies while the truck is sitting turned off, then you have an active circuit in the truck which should not be on (e.g. glove box or underhood light). To find the cause, an ammeter on one of the battery cables will show you a current drain and you can then pull fuses until the drain stops to find which circuit it is.
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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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My mechanic says my radio isn't turning off even with engine off and it drains my battery. Can it be a bad fuse? Alternator and battery are good, they say it's my radio/ short causing battery to drain per...

Did you install radio yourself? If so maybe you switched power and memory wires. Another possibility would be bad ignition switch which keeps accessories always on. Remove fuse for radio (likely 2 fuses, one always on for memory and another one for power, latest radios don't have memory lead) and check with meter how much power draw you have with ignition off. There going to be some draw by on board computer and alarm.
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Remove fuses to any after market accessories e.g. radio/CD, theft alarm, etc.

If neither of these prevent battery drain you'll need to systematically remove fuses until the offending circuit is identified.
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You will need to isolate the various loads to determine which is the culprit. The after market stereo should go dark when key is in off position and a door is open.

Theres a problem with Ford instrument panels (cluster) not sleeping. I'd isolate the radio first and then the cluster.

I have a used 2012 that gave me fits with parasitics. The following are contributors along with my work arounds.

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Have a short in wiring deadens batteries 2008 ram 3500

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

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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 alldata.com. 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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