What is the Purpose of the 12 Volt Accessory Circuit on Trailer 7-Way

Question:

96 Chevy Silverado 2500 4x4. Where is the wire going to on the trailer plug that is coming from the 40 amp breaker at the top of the diagram? Thank you

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Expert Reply:

You are referring to the 12 volt accessory circuit on the 7-way in the picture. This is the circuit in the 1:00 position of the 7-way as you are looking into the socket from the front. For the install of a brake controller this circuit is not required but it is used for maintenance charging trailer batteries and powering utility lights as well.

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Jameson C

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