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No juice?

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Old May 18, 2018 | 05:32 PM
  #1  
CowboyUp!'s Avatar
CowboyUp!
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Trailering
Joined: Nov 2015
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No juice?

I've got a 2002 F350 7.3 auto that won't start. The baterries are relatively new (within the past year) and have both been fully charged now and test fine. When I turn the key there is nothing, no noise, no interior/dash/head lights, no horn, nothing. I took a new relay and tried every spot in the fuse box with it as well as the spots in front of the firewall on the driver side. I checked and cleaned the connection of the cable on the fender under the air box. All with no change. We don't drive this pickup a lot lately and we went to move it the other day and it felt like the batteries were low (it's been plagued by a drain somewhere for years). However, I heard a faint "buzz/relay" noise that appeared to be coming from near the column shifter. We let the pickup be and came back to it a few days later and charged the batteries up good and now there is no juice. Sorry for the long post, but I'm frustrated and lost on what to check next. Thanks in advance!
 
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Old May 18, 2018 | 06:09 PM
  #2  
seville009's Avatar
seville009
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Joined: Nov 2004
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To definitely rule out the batteries, can you pull two batteries from your other vehicles and see if the truck starts with those two?

Another possibility might be loose or bad battery cables.

 
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Old May 18, 2018 | 09:28 PM
  #3  
RedTonka07's Avatar
RedTonka07
Junior User
Joined: Apr 2018
Posts: 81
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From: Jackson, MI
Loose negative is my guess when there is zero power

check battery hook up... wire brush them and then tighten them up
 
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