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Thank you for allowing me to assist you, my name is Joe and I will be happy to assist you with your concern today.
You will need to start by seeing if the problem is loss of the power or ground, to do this you will nest the power to that switch panel which will be the main power that feeds the breakers/switches, you test this using the ground neg terminal at the battery, if this is good you then check the ground bar to the accessories that panel controls. In most cases you will find a loose or bad connection, in some cases it will be a main breaker/fuse or a melted wire, sometimes the wire becomes disconnected. Again to identify/diagnose the problem you will need a voltmeter and or test light to preform testing as above.
Thank you!- Joe
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