Guys... I got a Hitachi EX300 LC-3 with a JRB Slide Loc coupler. The coupler isn't unlocking. This has the toggle switch in the cab to lock/unlock. I've traced the wiring and have power to the solenoid box. When I flip the switch to unlock it blows the fuse. If I disconnect the power lead to the box and flip it doesn't blow the fuse. So I figure something in the solenoid box is shorting out. Anyone happen to have a schematic for the box or install manual for the older slide-loc coupler ? Thanks!
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