I have a suspicion you have a monitor that just watches the seed drop, not population. For a population monitor you have to connect it to a radar or better yet, a GPS speed sensor. My Deere 7000 6 row had a monitor that only told me if the seeds were dropping. There was no alarm, just lights. Like the other guys said, clean sensor eyes and electrical connections is very important. After awhile, the eyes on the sensors become clouded and the sensor has to be replaced, unless someone knows how to polish the scratches out of them. There are three wires and I'm trying to remember the colors, but I think it's red, black and green. Red is power, black is ground and green is the sensing wire. I'm pretty sure about the color coding but I might be wrong. On a six row, there are 18 connections back there so there are 18 chances for a bad connection. The rectangular plug that connects the planter harness to the monitor harness usually doesn't give trouble but it doesn't hurt to clean those terminals too. It's pretty simple and basic once you become familiar with it. Jim
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