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.

something is drawing power

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Old 04-13-2009, 09:31 PM
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thefordguy
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Default something is drawing power

I have a fox mustang that draws power when car is off and always kills the battery i have no idea whats wrong with it any ideas?
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Old 04-13-2009, 09:39 PM
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mjr46
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multimeter set to amps hooked in series with neg battery terminal and neg battery post will indicate amount of draw, safe spec 25-50 milliamp and pull fuses until drain is in spec and there you'll have the circuit on which the draw exists, from there unplug components on that circuit until draw is gone and there will be the prob component, simple things to check are trunk light, glove box light, sunvisor lights or bad alt, this can be confirmed by removing the charge wire from alt/unplug it, and watching drain disappear on multimeter
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Old 04-13-2009, 09:40 PM
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j-wigg
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glove box light switch was doing it on mine only because i had and still have some dashes pieces off to paint. had to tape the switch closed. no bulb was in for me to see that the light was even on. and i didnt think it would draw power without a bulb in it.
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Old 04-13-2009, 09:55 PM
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thefordguy
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I pulled fuses one by one still did it and it is a major draw becouse as soon as you touch the terminal to batt it arcs alot
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Old 04-13-2009, 09:59 PM
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mjr46
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....you need a multimeter hooked in series like I said : read my post!!! like I said try unhooking the alt charge wire... read please!!
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Old 04-13-2009, 10:07 PM
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thefordguy
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its a brand new alt tho i will hook a multimeter up to it
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Old 04-13-2009, 10:16 PM
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mjr46
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here follow this:
http://flashoffroad.com/electrical/B...teryDrain.html
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Old 04-13-2009, 10:32 PM
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thanks ill read that
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Old 04-13-2009, 10:38 PM
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mjr46
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no problem...and good luck
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