Something strange happened to my 2005 Challenger 180 this season. When I brought the boat home from winter storage everything was working properly and it started right away (on trailer). I did the annual service (oil, filter, spark plug, charged the battery and so on). However, once in the lake nothing happened when I pressed the start button, it was completely dead. I tried disconnecting and connecting the battery a couple of times and suddenly it came back to life. However, now the tachometer and the beeper/buzzer doesn't work anymore. Tacho needle is just bouncing around. (Check the YouTube link below). Anyone now to troubleshoot this problem? I tried checking for error codes using Candoo pro but nothing came up besides the P0600 code, but that is said to be caused by Candoo pro itself. Any help is greatly appreciated.
https://youtu.be/jJi063POUbw
https://youtu.be/jJi063POUbw