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Ford F-350 Super Duty Questions

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auto transmission, linkage appears to be working
I have replaced twice and cannot get it to stay on. What can I do to get it to stay on.
In a 30 minutes drive turning left only and it won't do it when it idles for up to two hrs.?
I have running lights and backup lights to the trailer. Can't get any power to the signal lights and brake lights. I have checked all fuses and wiring and can't find the problem. I have been pulling my fifth wheel trailer for 2 years and have not had a problem until now. I have a 7 blade plug in the bed and on the rear bumper. Neither plug has power to the signal posts.
Right turn signal is normal, flasher switch also acts normally.
On the fuel pressure I have the REGULATOR UPGRADE KIT INTALLED.AND DON'T HAVE 68 LBS OF PRESSURE. ONLY 40 TO 45 LBS
Plus when I turn the key to the on position I get 45 lbs of fuel pressure on the fuel gsge. When I cycle the key off with in 5 seconds the fuel pressure drops to zero and the secondary fuel filter will drain. Is this normal
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