Look for a problem with the wiring in the trunk. Check ground wires.
Could it be the connector i replaced cuircuit board when i took off old one a pin was fried and in connector
Electricity could be back feeding through a shorted or reversed bulb installation. Fiddle around with that bulb on the left and see if anything changes. My Jeep did that once and it was blinking like a RR crossing.
Yes it could be in that connector.
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