There is a ground wire for both sides. follow the wire from the connector to body and clean, Test the 12 volt wire to make sure it has 12 volts. If not bad switch or bad wire or contact in the connector. Wiggle the connector first with the lights on to see if it changes.
sorry worded that wrong. you should have 12v at one wire with lowbeams on. You should have 12 volts at the other wire with the highbeams on. The ground wire should have 0 ohms from the connector to body. One way to test a wire to see if its broken or poor connection without removing anything is to touch the end of the wire with a meter and knowing that the other end is suppose to be bolted to the body you can touch medal anywhere, If get 0 then thats a perfect connection. If you get numbers then it is a dirty connection and if you get no reaction you have no connection.
glad I could be of service.
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I did test with a 12 volt tester (simple light) and there were no current going through. I'll follow the ground wires down to clean the connection.
It was a loose connection with the ground wire. Followed the ground wire to where it connects and cleaned the connection area, then reconnected the wire. All lights are bright and working as expected.
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