Lowrance GPS wiring manual

[beckoning]

Replacement boat came with an older Lowrance GPS that doesn't work. It won't run on. Discovered two wires were cut with no match plugged into the board. They're both black. Anyone (Lowrance isn't very helpful) have an older Lowrance GPS manual that identifies the wires coming out the back? Wire to sending unit is obvious. Can trace the power + ground. Need some diagnostic help.

 

[dingbat]

Discovered two wires were cut with no match plugged into the board.

What board?
Explain

Sending unit?
You mean the transducer?

If so, depending on the model and features, could be anywhere from 3 to 7 wires in that cable..

Try removing the transducer and network cable, if installed, from the unit and try again. If the unit has power and still will not come up, nine times out of ten it’s a bad power supply