Voltage question

[5keepers2]

Trying to help a buddy out. He has 998. It won't come on. I checked voltage and it tested 1.49 at input to unit. Starting battery tested 12.4. I checked both trolling motor batteries at 12.8 for comparison. Starting battery starts his 150 HP with no problem. I clean all connections leading to 998. Voltage now at unit input 12.49. 998 still will not come on. I removed power connector from hardness and individually put on back of unit and wiggle while pushing power on button. Nothing won't come on. I did not have transducer, and GPS connected while wiggling connection if that matters. Is this unit history? Is 12.49 enough voltage? Help /comments appreciated! Thanks

[Wayne P.]

Is another Humminbird number series or Helix available to test the power connection?

While 12.49 is enough to support the unit, that has to be under load, not measured with a VOM since a meter does not put a load on the circuit.

[5keepers2]

Thanks Wayne......will hunt another unit to try. What are the chances a new battery that produces 12.8 might correct problem? I guess I can answer that question by trying his unit on another boat that will accept the 998.

[Wayne P.]

Thanks Wayne......will hunt another unit to try. What are the chances a new battery that produces 12.8 might correct problem? I guess I can answer that question by trying his unit on another boat that will accept the 998.

The unit specs state voltage range 10-20V.

Just need another power source with the PC-10 or PC-11 plug. Don't need to match the unit model. That is any Humminbird unit with a number name or Helix. Some older models use that power cord also, the MATRIX 97 I had did.
Just remove the power cord plug from the cable collector and plug the power cord into the back of the unit with the plug tab pointed up---it won't work with the polarity reversed.