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.

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Old Dec 23, 2009 | 04:06 PM
  #1  
86capri's Avatar
86capri
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Default starting problem

my 86 has a duralast battery in it which is only 6 months old but if the car sits for more than like a week i have to jump it. why do you think this is. after i jump it then let it recharge it is fine as long as i drive it frequently.
Old Dec 24, 2009 | 09:32 AM
  #2  
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nitrous_bob
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From: st clair shores MI
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there is some kind of draw. you need to find out what isn't shutting off (alarm light ?? hood light ??) you can just add a simple battery cut off switch, that'd cure it til you got tired of having to pop the hood every time. or you could somehow add a tricle charger through the cig lighter. any battery hooked to a cig lighter adapter would power all the 12 volt stuff... it would die b4 the battery died and would be much more PITA then a switch... but maybe you have an iverter in your garage or something... just a suggestion but a long shot
Old Dec 24, 2009 | 10:38 AM
  #3  
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floodzilla
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From: L.I. New York
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this happened to my freind, it ended up being a current draw form a badd circuit in the fuse box, you need to get yourself a multimeter and go to town lookin for that power draw
Old Dec 25, 2009 | 01:11 PM
  #4  
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mjr46
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hook a dvom in series with neg battery terminal to post and set dvom to amps and measure current draw, 25-50 milliamps is safe at rest draw, if more pull fuses until draw is removed identifying circuit draw is on, back trace from there LUK
Old Dec 26, 2009 | 12:35 AM
  #5  
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luckythirteen13
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From: las vegas, nv
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check for melted wires, i had the same problem with my car. its not a DD so it some times sits for months. turned out one of my down pipes melted a wire bare and the wire was constantly touching the pipe, causing electricity to drain
Old Dec 28, 2009 | 01:13 PM
  #6  
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86capri
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thanks. i had a feeling it might have to do with the plug underneath the driver's seat. i had an extra one so i decided to put that one on and see if that solved it. unfortunately i didn't realize i wouldn't be able to figure out where the wires go lol. does anyone know? there are 4 wires and 4 prongs on the plug, i just don't know which go where.
Old Dec 28, 2009 | 03:00 PM
  #7  
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mattdel
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From: Spfld, MA
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if its an empty plug, there can be no current draw on it, as its not plugged into anything.
Old Dec 29, 2009 | 01:48 PM
  #8  
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86capri
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lol i know, it was plugged in i unplugged it to switch it for a different one but i couldnt switch it because i dont know where the four wires go
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