Page 168 - REPOWER REFERENCE GUIDE (2020)

Corrosion Protection

MerCathode Definition Possible Causes Summary of Fault Correction Possibilities
LED
• Disconnect shore power and other electrical
components one at a time and verify if reading
decreases.
• Check connection at the "R" terminal.
• Stray current
present. • Measure hull potential by connecting the positive lead
1 flash per 4 Reference voltage of the multimeter with the controller pigtail, and the
seconds is above 1.04 V • Poor connection at negative lead to the "–" post of the controller.
the "R" controller
terminal. • Measure hull potential with the service probe and
compare with the controller reading above. If these
differ significantly, then replace the controller.
• Consult Mercury Technical Service if further review is
necessary.
Reference electrode wires
1 long flash per Shorted or open Identify where the wires may be compromised. Replace
10 seconds reference terminal pinched or cut, electrode the anode and reference electrode assembly if necessary.
damaged.
Anode wires pinched or
2 long flashes Shorted or open Identify where the wires may be compromised. Replace
per 10 seconds anode terminal cut, anode assembly the anode and reference electrode assembly if necessary.
damaged.
Open anode and • Boat out of water/dry • No action necessary, if boat is out of the water ‑ this is
reference terminals dock condition. normal LED flash sequence.
1 long flash per
60 seconds ‑ Boat out of • Both anode and • If boat is in the water, then identify the open circuit
water/dry dock reference electrode issue with both the anode and electrode assembly.
condition circuits are open. Replace if necessary.
• Check battery voltage. Must be 12.6 V or higher.
• Battery connection • Check 5 A fuse in wire harness to controller.
bad.
LED light not on Green light not on • Controller may have shutdown due to thermo limit of
• Battery dead. 100° C. Wait for controller to cool down, and see if it
• Controller faulty. turns back on.
• If no other issue is found, then replace the controller.

35936
MerCathode assembly connector

NOTE: Corrosion information available in Marine Corrosion Protection Guide (90‑881813 01).

Page 6D-6 © 2019 Mercury Marine 90-8M0149179 eng NOVEMBER 2018