It sounds like you have your trailer brakes adjusted properly so checking the voltage from your brake controller is definitely the correct route to go. Start at the 7-Way plug on your tow vehicle and test the pin in the 5 o'clock position with a multimeter like part # PTW1714 to see if you are getting 12V power when you use the manual override on your controller with it set at the highest power setting.
If you don't get power at the 7-Way then the next step is to test the wiring from... view full answer...
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