Keystone has a habit of building every trailer a bit differently, but the circuit is supposed to originate at the battery, go through the DC mini-breakers to the power center fuse panel, from there, the individual circuit should go back to the bed. Typically, there is only one device on a DC circuit that has a "high amp draw" such as a DC motor or DC heating element.
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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