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Originally Posted by BigRedTitan
Mine checks out OK too. It sounds like it may have relays for each turn signal and the brake lights. It also mentions connecting the fuse end to the BCM. So, I figure that if there is a short in the wiring on the trailer, it may kick the fuse so that you don't have a fire situation. Sounds logical to me. 
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That's what I figured. Problem with me is, I've spliced into the turns signals at the BCM, and don't want the dealer to see it and tell me my warranty is void. Do you think the dealer will just give me the subharness?