5.0L (1979-1995) Mustang Technical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.

Parasitic drain somewhere HELP

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Old Jul 25, 2009 | 08:01 PM
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87Redfox's Avatar
87Redfox
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From: Chicago, IL
Default Parasitic drain somewhere HELP

So the day before im selling my car i find a major parasitic draw on the battery of 8.7 amps which is HUGE. Did a parasitic draw test and yanked every fuse and yanked the ignition harness and Im still getting a huge draw on it. Now when i detach the fusible links under the hook the drain goes away. The large gauge green wire and the yellow wire which splits to 4 other fusible links. Something under the hood is causing this drain. I have a new alternator and new starter solenoid so i ruled those out. What else can i check???
Old Jul 25, 2009 | 08:49 PM
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mjr46
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don't be so sure on the alt just cause it's new, pull the charge wire/ unplug the connector to it and see what happens, also if you have any aftermarket stuff wired in such as a huge stereo unplug that stuff while watching the dvom
Old Jul 26, 2009 | 01:35 AM
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87Redfox
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tried that already
Old Jul 26, 2009 | 02:53 AM
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Liquid_02
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Originally Posted by 87Redfox
So the day before im selling my car i find a major parasitic draw on the battery of 8.7 amps which is HUGE. Did a parasitic draw test and yanked every fuse and yanked the ignition harness and Im still getting a huge draw on it. Now when i detach the fusible links under the hook the drain goes away. The large gauge green wire and the yellow wire which splits to 4 other fusible links. Something under the hood is causing this drain. I have a new alternator and new starter solenoid so i ruled those out. What else can i check???
Fuel pump isn't still running is it? That's the amount of drain it would have if it was, and there is a TSB on the fuel pump relays sticking. Yellow wire is power for the FP, as well as a few other things. Just remove the FP relay and see what happens.
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