You didn't say what toad you have but I assume that it is wired for a 4 wire system. Although the toad may have amber turn signal lamps, it may use the brake lights for turn signals when connected to the coach. The coach has a 5 wire system and has amber turn signal lamps. If the coach to toad cable has 4 wires, your coach will have a 5 wire to 4 wire converter module which could be defective. This is an after market modification and may have been installed by an RV service shop. Use a test lamp or meter to check the turn signals at the connector socket on the coach. The signals will be left turn/brake, right turn/brake, lights, and ground.
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2005 38FDTS
2011 Ford Edge
Fredericksburg, TX
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