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Tracy Martin TN 
Orange Level Access
Joined: 11 Sep 2009
Location: Gallatin,TN
Points: 10624
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 Topic: 2016 Ford 550
Posted: 31 Oct 2019 at 6:29pm |
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My friends 550 , the running lights and tail lights won't work. All others and signals OK. What is likely culprit? Dealer is little to no help. Thanks Tracy
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No greater gift than healthy grandkids!
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TMiller/NC
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Joined: 11 Sep 2009
Location: Lenoir, NC
Points: 1774
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Posted: 31 Oct 2019 at 6:43pm |
Tracy, my neighbor has a F350 not sure of year, but fairly late model, was having problems with tail lights, found a loose ground near rear of frame on drivers side. It appeared to have not been tightened at factory.
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Tracy Martin TN
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Joined: 11 Sep 2009
Location: Gallatin,TN
Points: 10624
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Posted: 31 Oct 2019 at 7:01pm |
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miller, I will check that out. Thanks, Tracy
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No greater gift than healthy grandkids!
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jaybmiller
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Joined: 12 Sep 2009
Location: Greensville,Ont
Points: 22460
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Posted: 31 Oct 2019 at 8:56pm |
could be a fuse..dang new trucks have 30-40-50 fuses in them ! My 97 F150 has THREE fuse panels.....my 57 Willys had 5 fuses...... hopefully you've got the owners manual, they DO list fuses, least mine does...
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3 D-14s,A-C forklift, B-112
Kubota BX23S lil' TOOT( The Other Orange Tractor)
Never burn your bridges, unless you can walk on water
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baverwolf
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Joined: 24 May 2010
Location: SE Montana
Points: 828
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Posted: 31 Oct 2019 at 10:31pm |
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Had same problem on my 2016 f250. It was a blown fuse caused by a wire that had gotten pinched. I'm guessing the 550 and 250 are wired the same so I'm gonna bet you have a blown fuse caused by a short somewhere.
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DMiller
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Joined: 14 Sep 2009
Location: Hermann, Mo
Points: 31070
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Posted: 01 Nov 2019 at 6:03am |
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Fuse blocks under the hood, tend to corrode really bad and have Lighting Relays as well to reduce amperage flow thru the Lighter duty switches, the relays are not well marked except in the manuals. The Relays are troublesome.
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LeonR2013
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Joined: 01 Jan 2013
Location: Fulton, Mo
Points: 3500
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Posted: 02 Nov 2019 at 3:50pm |
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You need someone to work on it who has a high dollar ohm tester. My son is the guru on Ford electronics and that is what you will need for your truck. In fact that's what you need for all vehicles in the world today. Leon
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