If you are lucky, the problem will be as simple as I encountered two weeks ago when taking our trailer out.
Hooked it up, brake lights working, turn signals working, no running lights.
Unplugged the cable from the truck, plugged it in and out a couple of times - back in again all lights working! Poor connection in the plug! Always a good thing to check first!
If the contacts in the plug / socket look corroded or dirty you can often brighten them up a bit with a small needle file or similar, (being careful not to short anything!) Then a dab of dielectric grease could help as preventative mtce.
Brian.
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Brian & Connie Mitchell
2005 Classic 30'
Hensley Arrow / Centramatics
2008 GMC Sierra SLT 2500HD,4x4,Crew Cab, Diesel, Leer cap.
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