So there I was driving the boat..Ran up on an shoal and killed the engine. Went to restart but only had 10.5 volts to starting battery. Called a friend who brought a jumper box. Got the battery jumped and engine cranked. But now al my gauges are pegged out. I can turn engine off but turn the key and all gauges peg to the right. Ive looked for grounding issues and cleaned the battery terminals but just cant find the issue. Any suggestions or knowledge is welcome