was running across the lake at full throttle when all of a sudden i completely lost power and came to an idle. boat would not go anywhere or get up on plane and power just wasn't there. motor would start but no power and running weird. i noticed a red light indicator icon on water guage, the icon had like water ripples across it and lit up red. i dont think i have ever seen that light lit up before. i pulled lower unit to find impeller in great condition. what should i be looking for ? Thanks for any advice.