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02 excursion 5.4 problem pleas help

Old Dec 20, 2019 | 09:20 AM
  #1  
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02 excursion 5.4 problem pleas help

So recently recently I purchased a 02 excursion been having problems with battery drain and wont crank I've replaced battery and alternator still having issue drains battery and wont crank ? I've checked voltage positive wire and its throwing 14.3-14.5 battery and alternator aswell cant seem to figure out the problem
 
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Old Dec 20, 2019 | 09:42 AM
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Originally Posted by Simonv210
So recently recently I purchased a 02 excursion been having problems with battery drain and wont crank I've replaced battery and alternator still having issue drains battery and wont crank ? I've checked voltage positive wire and its throwing 14.3-14.5 battery and alternator aswell cant seem to figure out the problem
the fusible links on the alternator cable and the starter negative cable are prone to corrosion... Will still check good voltage because the voltmeter has a good connecting and the alternator has good output, but as soon as you take the vm away, there's a high resistance connection again and it won't charge your battery.
 
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Old Dec 20, 2019 | 11:00 AM
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@projectSHO89 is the resident electron guru so hopefully he can chime in.

in the mean time lets see if we can narrow down the scope of the issue.
:
what is the rate of Draw ?

are there any non factory electric devices such as radio , amps , converters ?

do you have access to a power probe or a multimeter ?
 
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Old Dec 20, 2019 | 07:48 PM
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Check the globe box light and see if its not staying on. Has happened to me in my X and in my OBS.
 
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Old Dec 20, 2019 | 10:00 PM
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Had the same type of scenario happen with my old '98 Expedition with the 5.4. Drove me nuts for about a month trying to figure it out.

I ended up replacing the main battery cables, both positive and negative, with OEM replacements and it fixed the problem. My best guess is the wires started to corrode inside the insulation and it was shorting at the connections. Had a similar problem with the positive wire on a car a few years before that.

That Expy is still happily cruising down the road with no issues since I fixed that (a friend bought it a couple years ago for a work car).
 
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