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Help 2002 excursion 7.3 liter

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Old 06-17-2014, 12:52 PM
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Help 2002 excursion 7.3 liter

In the last 8 months I have changed the battery, alternator, starter.
My problem now is when I attach my batteries there is an instant draw that brings the batteries down to 3.5 volt and no lights will turn on. I have tried pulling all the relays under the dash and in the engine compartment.
Does anyone have any ideas where else to start looking for a short?
 
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