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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!