I'm struggling to figure out why I can't power on my fishfinder, and I'm hoping the sharper and more experienced minds of this forum can help me make traction. Here's the situation: I recently purchased a Garmin Echomap UHD 93sv with GT54UHD transducer. I also purchased an Amped Outdoors 15Ah LiFePO4 battery to power it. My multi-meter is reading 14.5V at the battery, at the end of the power cable, and at the pins of the fishfinder cradle. The headunit needs 12V to power on, so I can confirm I'm getting enough power to the cradle. When I plug the head unit into the cradle, even though the cradle is getting 14.5V, it will not power on. This seemed like the issue would be a bad headunit or cradle.
I took the headunit and cradle to Scheels to test on their power and confirm. I plugged the headunit and cradle into a demo station and the headunit powered on as soon as I hit the on button. So I'm at a loss.
The issue clearly isn't the cradle or headunit, since it turned on at the store. So it must be my wiring setup, or my batter, right? But I'm reading 14.5V from the battery all the way to the cradle. Any help would be greatly appreciated!