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I haven't had a chance to try TLanes' approach to finding the problem. Today however, I used a snowmobile battery to power all the trailer plug positions without the truck hooked up. I still was able to simulate the same problem. Even more weird, the truck tailights act the same without the trailer cord hooked up. Now I'm really baffled ! Are there any TSI letters dealing with this ? Maybe my problem is the truck and not the trailer. That still doesn't account for the trailer screwing up when the truck is not attached. Any ideas ?
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