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You replaced the 1157 bulbs with LEDs, but what? As I'm sure you are aware the 1157 has two incandescent filaments that share a common ground.
Do you know if the 1157 replacement LEDs are bidirectional? This is really two (or more) LEDs that are in parallel but with their polarity reversed so it doesn't matter how they are installed. I can't see why they would be since they are probably in a bayonet style package. You could test for that by connecting 12vdc one way and then reverse the polarity. If it lights in both directions then it is bidirectional. That could begin to explain the screwy operation.
Or...I suppose one or more of the LEDs could have a high reverse current- can you measure mA in both directions?
Do you know if the 1157 replacement LEDs are bidirectional? This is really two (or more) LEDs that are in parallel but with their polarity reversed so it doesn't matter how they are installed. I can't see why they would be since they are probably in a bayonet style package. You could test for that by connecting 12vdc one way and then reverse the polarity. If it lights in both directions then it is bidirectional. That could begin to explain the screwy operation.
Or...I suppose one or more of the LEDs could have a high reverse current- can you measure mA in both directions?