I figured I would share some recent advice from my dad (since he's not on the forum).
"To keep your boat in ship shape, don't forget to carefully inspect the sacrificial anodes, commonly called zincs. Don't just visually inspect them. I have had zincs that looked great but when I pushed on them with a screwdriver the shell gave way to almost nothing. If you have never had a real problem with your zincs then start losing zinc material quickly, then make sure you do not have an on board problem, this may require someone with more expertise than the owner may have. If your on board electrical is ok, them move on to the shore power side."
"To keep your boat in ship shape, don't forget to carefully inspect the sacrificial anodes, commonly called zincs. Don't just visually inspect them. I have had zincs that looked great but when I pushed on them with a screwdriver the shell gave way to almost nothing. If you have never had a real problem with your zincs then start losing zinc material quickly, then make sure you do not have an on board problem, this may require someone with more expertise than the owner may have. If your on board electrical is ok, them move on to the shore power side."