"TRAILER DISCONNECTED" - Ford Powerstroke Diesel Forum
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post #1 of 15 Old 05-16-2008, 10:41 AM Thread Starter
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"TRAILER DISCONNECTED"

When I hook up to either my box trailer or my boat trailer it doesnt register either one. I will pull the two switches together to make them apply the brakes and it says "TRAILER DISCONNECTED" does anyone know what the problem is? My local Ford Dealership couldnt figure it out this morning!

Tim S. MISSISSIPPI GULF COAST
2000 F250 w/ 28.5 CHASE N HOOKERS LIFT
SOLD: 2008 F350 King Ranch CC/LWB Dually, SPARTANIZED DPF DELETE, AFE STAGE II
SOLD: 2006 F250 XLT CCSWB FX4 w/ 6" Lift on 37" BFGs
SOLD: 2008 F250 Lariat CCSWB 4X4 Stock W/Spartan DPF Delete & AFE
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post #2 of 15 Old 05-16-2008, 11:39 AM
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I had this problem but I can't remember what it was. I want to say that the ground and the trailer brake wire were backwards.. I was using an adapter for 7 prong to 6 prong and I had to "re-wire" the adapter..

John Wayne
Owner and Operator of the
REDNECK VALDEZ
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post #4 of 15 Old 05-30-2008, 10:02 AM
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I have had this same problem with 3 of my trailers. One of which I bought brand new and had the same problems. Dealer has had it 3 times and cannot figure it out. Says its my trailers or the adapter plug.

2008 F250 FX4, 6.4ltr PSD, Torqshift, crew cab, short bed, leveled, 20x9 MB Motoring V-Drive's with 35" BFG All Terrain's.
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post #5 of 15 Old 05-30-2008, 11:17 AM
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Message center displaying "Wiring Fault On Trailer":
This may occur due to water intrusion/corrosion in the trailer connector socket or the connector behind the socket. If corrosion is present, replace the socket and harness and lube with silicone dielectric grease. If there are no signs of water, perform normal diagnosis. Broadcast Message 7052, 7108.

I have seen some of the connectors with very little dielectric grease in them. Pull the connector off and clean everything good, then fill the bastard with dielectric.

Steve Cifra
Nashua, NH
'08 F350 CC DRW LB 4.10ls
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post #6 of 15 Old 05-30-2008, 12:41 PM
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I get trailer disconnected, not wiring fault...

But, the brakes will still work if you pull the slide on the controller, but not just by pressing your foot on the brakes.

2008 F250 FX4, 6.4ltr PSD, Torqshift, crew cab, short bed, leveled, 20x9 MB Motoring V-Drive's with 35" BFG All Terrain's.
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post #7 of 15 Old 05-30-2008, 02:03 PM
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I have had the trailer disconnected message as well, but I had no brakes at all. Was tough to get an 18k trailer stopped with just the brakes on the truck. I looked for any place where the wiring may be rubbing on the truck and made sure all the contacts looked good and found nothing wrong. If I unplug the trailer then plug it back in everything will work again.

2008 F450 4X4
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post #8 of 15 Old 05-30-2008, 03:09 PM
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Actually any message about the trailer/wiring can be caused by the connector. It is an easy 5 minute check.

Steve Cifra
Nashua, NH
'08 F350 CC DRW LB 4.10ls
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post #9 of 15 Old 05-30-2008, 05:57 PM
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i'm having the same problem the truck will not read the trailer it did the first couple of times but now it will not

2008 F250 CC LB Lariat
20's With 34s on them
recon mirror and cab lights
spartan 250
5 inch mbrp
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post #10 of 15 Old 06-04-2008, 10:18 AM
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My problem is similar, but it usually comes up with the message while I'm driving and I just touch the connection and it clears. I can't figure out what it is because it happens with all 3 of my trailers, but only on the 450. The other trucks are other brands

Ardi Villiard
'08 450 4x4 6 sp man, loaded.....POS
LEMON LAWED 10/8/08

05 F350 FX4 Lariat, CC, LB, auto, loaded
Volant Ram Air intake
4" turbo back, no kitty
Over 100K
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