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> Parasitic battery drain help, Battery is being drained daily! please help!
post Apr 3, 2012 - 8:23 PM
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deadxwreckoning



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Hello everyone.

I got a small issue that maybe you all could help me out with? My fan relay blew last week, and my fans have been modified to run 24/7 when the keys are inserted. I bought a new relay, and it was supposed to be an authentic Toyota relay, but it was some cheap Taiwan knockoff, anyway it works though. The next day, my battery died while driving and would not hold a charge, so I replaced the battery that night. The next day after the battery was dead again when I went to start the car. Something is causing a large parasitic drain on the battery. Anyone have any ideas on what could be causing this? Maybe the fan relay because it's a cheap knockoff? Any help would be appreciated. Car is a 1995 JDM GT-FOUR.

Thanks


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1995 JDM Toyota Celica GT-FOUR
Precision 6262 DBB @ 23 lbs
Fully Built - AEM Standalone - E85
504 AWHP 3S-GTE FTW!
 
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post Apr 3, 2012 - 8:43 PM
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Special_Edy



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QUOTE (deadxwreckoning @ Apr 3, 2012 - 9:23 PM) *
Hello everyone.

I got a small issue that maybe you all could help me out with? My fan relay blew last week, and my fans have been modified to run 24/7 when the keys are inserted. I bought a new relay, and it was supposed to be an authentic Toyota relay, but it was some cheap Taiwan knockoff, anyway it works though. The next day, my battery died while driving and would not hold a charge, so I replaced the battery that night. The next day after the battery was dead again when I went to start the car. Something is causing a large parasitic drain on the battery. Anyone have any ideas on what could be causing this? Maybe the fan relay because it's a cheap knockoff? Any help would be appreciated. Car is a 1995 JDM GT-FOUR.

Thanks

If you have a multimeter you can perform a simple test to locate the drain
Turn the car completely.off and make sure no interior lights or anything are on. Also do not turn anything on during this test(simply turning the keys on could blow the fuse in the multimeter).
Disconnect the negative battery cable and connect the leads of the multimeter so that they bridge the gap between the negative terminal and the negative battery cable, completing the circuit. Now set your multimeter to measure milliamps in DC. Check the reading (of the top of my head it should be below 12 milliamps?)
Remove the fuses from the fusebox under the hood one by one until you locate the one pulling the most amperage, this is your parasitic drain. Now you will have a general idea of which circuit is the culprit.
If you must check the interior fuses, you will need a helper(one person watching the multimeter under the hood and one in the car) and you must manage to check the interior fuses with the door shut or hold the door ajar sensor(button two inches below the latch on the door jamb) down to trick the door into thinking it is shut. I dont think opening the door will draw enough amperage to blow up your multimeter but I definately wouldnt suggest trying.
Anyways, its a great test for the do-it-yourselfer and half the mechanics in the world dont even know how to do it. I would suggest it to anyone as it can be quite supprising how much alarm systems, aftermarket stereos and especially self leveling systems can drain the battery while youre away

Hope this helps, let me know the results and tell us if you have any hang-ups

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