This box contains the 110 volt transfer switch. The coach's source of 110V current can be from either a heavy cord plugged into an outlet or from the on board generator. The box was dismounted when the engine bay was relined and has now been remounted. The black cord is for landline power and the flexible conduit leads to the generator. The switch inside the box transfers the coach's system to whichever system is live. If both are live, this one selects the generator. They can be set up either way.
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