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S Chassis Technical discussion related to the S Chassis such as the S12, S13, S14, and S15.


 
 
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Old 10-19-2009, 08:42 PM   #1
anonomousdrift
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Unhappy Parasitic Drain Problem

I'm kinda new here and have used the search function to help me through my problem but now im stuck and am hoping for some insight.

Arrite so I picked up a 93 coupe about a month and a half ago. car ran well (other than the brake light on the dash being lit at all times) up to about two weeks ago when the battery died on me. so I called the previous owner and he said the battery had been replaced in september of this year so I thought I had maybe left something on in the car so I jump started the car and the battery stayed charged for only a few hours before it died again. I noticed the battery light was dimly lit so after seaching on here I thought it was the alternator so I jumped it again and took it to kragen to get tested and both the alternator and battery came up good. so I started checking the fuses and three were popped in the fuse box under the hood, the 10A eng cont and the 10A horn fuses, and the FL25A mtr ret fuseable link. I replaced all three and the lights on my dash go off. I thought everything was fine but I guess it wasnt because the battery still drained if the car sat for more than a few hours. I went out and got a DMM and decided to check the voltage of the battery. I jumped the car again and the battery, when the car was running, was around 14V and when I turned the car off after running for about 15 minutes was around 12.6V so everything seemed fine with the charging system. So I started testing for parasitic drain and there was a .5A current being drawn with everything off in the car. start pulling fuses to check for which circuit was draining the battery and it turns out the FL25A eng cont fuseable link dropped the current down to .03A, which I looked up and seems to be okay. I checked the link but it wasnt popped. I replaced it anyway but the link is still drawing the .5A current. I searched and found out the FL25A eng cont fuseable link goes to the ecu so I guess thats whats drawing the current? Does that mean there is a short in the harness somewhere or that something is wrong with something else that the ecu controls? I've been searching for the solution and have finally narrowed it down but I just dont know what else to check in relation to the ecu.

Cliffnotes:
-car died, battery dead (battery about 2 months old)
-jumpstart and dies after sitting for few hours
-take to kragen
-alternator and battery good
-replace popped fuses
-battery still dies
-check for parasitic drain
-FL25A eng cont fuseable link drawing current but not popped
-replace link but still draws current
-ecu or something connected to it still drawing current?

If anyone can help I'd really appreciate it. If there is any information I forgot to include just let me know.
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