[PerryC]

Steve,
Did the actual head of the unit ever get doused? Does the power connection to the battery have spade lugs that slip onto flat connections, or are they a ring connection that goes around a battery terminal? Is everything finger tight at least?

Backing up though, make sure you don't have something like the depth range set for 400-600 feet of something like that, or the sensitivity set to zero, or some setting way off. See what happens if you turn everything you can to "Auto" mode. Have you visited their website for a troubleshooting section?

Most ff units if they don't see the puck will warn you, so that may not be the problem. If it's power related, it more often a bad crimp or splice or corrosion that does not let all the available amps in the battery reach the unit per say. If you have terminals/splices and the tools, you may cut off the battery connections and see if the actual power wire has corrosion in the strands. Corrosion will leech up the actual wire inside the insulation several feet and make it unusable.

Or, it could be the harness is bad also. With so much coming in from China and who knows where, wiring harnesses are being made abroad in abundance and we used to see alot of bad ones at work. Hope this helps,
Perry