Bought a FT757GX on eBay. It came with the wrong cable.

The Operators Manual says the Jones connector should have two pins
jumpered, with nothing else normally applied there. Then plus 13.8V
and ground are applied to the other two pins.

This cable had plus 13.8 going to BOTH supply pins. Ground was
connected to both of the pins that were supposed to be jumpered.[1]

I learned this when I disassembled the Jones plug after smoke came out
of the rig.

I only have the Owners Manual, not the maintenance manual, so there's
no schematic to check.

If anybody has the schematic, what did that cable apply 13.8V across?
I haven't opened up the rig yet. Too annoyed.

Don NR7X
[1] Can anybody tell from that info what equipment this cable was
supposed to be connected to?