There's nothing strange about that at all... turn signals are a completely different circuit (and a different filament in the original taillight bulbs) than the actual tailights. (NOT sure what type of LED setup you may have replaced them with.)
There should be 4 wires going to the back... BROWN for ALL tailights and marker lights, YELLOW for LH brake/turn signal light, GREEN for RH brake/turn signal light, and a fourth wire for the backup lights.
The brown tailight wire needs to be "hot" anytime the lights are on, regardless of whether the turn signals or brake lights are in use.
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Today's Featured Article - Restoration Story: 1929 McCormick-Deering 10-20 - by Randal Simmon. On July 4th 1998 my dad and I was sitting on the front porch when he said that he was going to sell his two 10-20's to a junk man. He said that the junk man was going to give him $500 for both of them but he hadn't received the money for them yet. So I went into the house and wrote him a check for $500 and bought them myself and said now they are mine. He had bought them about five years before thinking that he was going to restore them himself. After five years sitting in the barn, he changed h
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