When equipped w/ both 4-pin and 7-pin, the 7 usually splices into the four. Have you inspected wires and splices? If 7-pin has a separate factory plug underneath to tap the 4-wires, have you inspected Plug for corrosion? In either, the OTHER 3 function pins are wired separately. Do all coach rear lights work properly? The REAR TS are usually tied to the trailer harness, fuse/ relay too. Most trailer coach wiring issues are due to harness wire damage, so inspect/ repair that first?
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THenne1713
2000 Conquest LE 6266, Class-C on 99-E450SD, 6.8, 2v, V-10
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