Regal 2000 ES Owner's Manual page 156

Chapter 3
Zinc Anodes
Sacri cial zinc anodes are located on the outboard drive housing,
trim cylinders and/or prop sha to protect so er metals exposed to
the water. Electrolysis attacks the least noble metals rst. Because
zinc is a less noble metal, it will decompose before other metals.
Check these zinc anodes periodically and have them replaced when
they are 30% consumed. Notwithstanding, zinc is the most popular
metal used to protect parts that are exposed to saltwater, freshwater
or brackish water.
See the photos below for anode location on your outboard.
a marine professional who can measure the galvanic activity with a
special electrode and VOA meter. Refer to the engine manufacturer's
manual for exact anode location and detailed information.
1-78
Zinc anodes in brackish or salt water
need to be checked more frequently. If
the anodes seem to be requiring frequent
replacement there may be a boat leaking
DC current into the water taxing the
anodes. This is especially possible
around a marina environment. Contact
Inspect the ground leads for tightness if
attached.
Parts damage due to galvanic or stray current
corrosion is not covered under warranty.