Dutton - Remove, clean and replace all of your grounds. Starting with the house battery(s) and following the wires. Both your power (+) leads and your grounds must be clean and tight. Take them off at each connection and clean them. Visually looks good isn't always so. Cannot count the times I helped friends with the same issue, it is always poor and/or loose connections, especially after winter layup. Just did one last Friday. Dirty grounds at the battery grounding junction. Cleaned them up and good to go.