Recent thread gave replies of 3-8 months. I dove Touche' yesterday to change the zincs and found the prop zincs were only about 20% sacrificed. Best I recall, those zincs have been on the shaft for about 18 months.
On the other hand, I seem to go through engine heat exchanger zincs about every 6 months. Go figure. I recall the yard installed the present zincs. Maybe they aren't making good contact with the shaft (doubtful). I install only Camp brand zincs, coat the copper contact with TefGel and give the zincs a good whack on either side to seat the contact. More likely, the boat has just been in slips with little stray current. Touche' has a Newmar galvanic isolator. Anyway, just another data point for any interested listers. Dennis C. Touche' 35-1 #83 Mandeville, LA
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