CORROSION PROTECTION
CORROSION PROTECTION
CORROSION PROTECTION
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<strong>CORROSION</strong> <strong>PROTECTION</strong> - ALL MODELS SERVICE MANUAL NUMBER 11<br />
Low Readings<br />
Cause<br />
Remedy<br />
1. Loss of continuity between drive unit<br />
components and negative (-) battery terminal.<br />
2. Shore power green safety grounding<br />
lead not isolated from the power package<br />
ground (on boats equipped with<br />
shore power).<br />
3. Underwater metal parts on the drive unit<br />
and/or boat are unpainted or the paint is<br />
in poor condition. The boat has more exposed<br />
metal than the anodes and/or<br />
MerCathode system can protect.<br />
4. Anodes painted.<br />
5. The anodes are improperly grounded or<br />
inactive.<br />
6. Anodes consumed (no longer protect).<br />
7. Drive unit and/or boat bottom painted<br />
with anti-fouling pant containing copper<br />
or tin.<br />
8. MerCathode reference electrode or<br />
anode painted.<br />
9. Anodic heads used instead of plastic<br />
caps.<br />
10. No power to MerCathode controller.<br />
11. Poor connection between reference<br />
electrode lead (brown) or anode lead<br />
(orange) and MerCathode controller.<br />
1. Ensure that continuity devices are not<br />
missing or damaged and that connections<br />
are clean and tight.<br />
2. Disconnect shore power and notice if<br />
reading increases. If so, install a Quicksilver<br />
Isolator 76664A3 or an isolation<br />
transformer.<br />
3. Prime and paint underwater metal parts.<br />
This will reduce the load on the anodes<br />
and/or MerCathode system.<br />
4. Remove paint or replace anodes.<br />
5. Clean anode mounting surface or<br />
replace anodes if they have oxidized.<br />
6. Replace anodes if eroded 50% or more.<br />
7. Avoid any electrical interconnection<br />
between the MerCruiser product, Anodic<br />
Blocks, or MerCathode system and<br />
the paint by allowing a minimum of 1-1/2<br />
in. (40 mm) of UNPAINTED area around<br />
these items on the transom of the boat.<br />
8. Remove paint.<br />
9. Reinstall the plastic caps.<br />
10. Connect the positive (+) volt meter lead<br />
(set on 0-20 volt scale) to the positive<br />
(+) controller terminal and the negative<br />
(–) volt meter lead to the negative (–)<br />
terminal. The meter should indicate battery<br />
voltage. Check for a blown fuse (if<br />
so equipped) on the starboard MerCathode<br />
system. Clean the connection or<br />
repair wiring as required.<br />
11. Clean and/or tighten the connection.<br />
Repair the wiring.<br />
Page 7A-22<br />
90-17431--4 MARCH 1998
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