Mercury 8.2 MAG Operation & Maintenance Manual

Section 4 - Maintenance
Page 72 90-8M0113924 eng DECEMBER 2015
A constant LED indicates that the system is operating correctly. A flashing LED indicates that a fault has occurred, or that an
abnormal condition exists.
a - LED
IMPORTANT: When a boat or new drive is first put into service the LED may initially indicate that the protective current is not
being supplied through the MerCathode anode. This condition is normal, and, in such cases, the LED may flash for a period.
The light from the LED will become steady after the boat is moored for a period of eight hours without operation.
MerCathode LED Codes
MerCathode LED
Definition Required Action
On (no flash)
No fault. The controller is
working properly.
No action is necessary. This is the normal LED indication for a
properly functioning MerCathode system.
2 flashes per second
Reference voltage is below
0.84 V.
This may be normal. Monitor the LED over time. If the flashing
continues, contact your local Mercury Service dealer for
assistance.
1 flash every 4 seconds
Reference voltage is above
1.04 V.
Contact your local Mercury Service dealer for assistance.
1 long flash every 10
seconds
Shorted or open reference
terminal.
Contact your local Mercury Service dealer for assistance.
2 long flashes every 10
seconds
Shorted or open anode
terminal.
Contact your local Mercury Service dealer for assistance.
1 long flash every 60
seconds
Open anode and reference
terminals, or the boat is out of
the water/dry docked.
• If the boat is out of the water, no action is necessary; this is
a normal LED flash sequence.
• If the boat is in the water, contact your local Mercury Service
dealer for assistance.
LED not on
Controller is not operating or
is faulty.
• Check the battery voltage; it must be 12.6 V or higher.
• Check the 5‑amp fuse in the controller wire harness.
• If further assistance is required, contact your local Mercury
Service dealer.
Anodes and MerCathode System Locations
IMPORTANT: Replace sacrificial anodes if eroded 50 percent or more.
The following sacrificial anodes are installed at different locations on your power package. These anodes help protect against
galvanic corrosion by sacrificing their metal to be slowly eroded instead of the metal components on the power package.
MerCathode system—Electrode assembly replaces the anode block. System should be tested to ensure adequate output. The
test should be performed where boat is moored, using Quicksilver reference electrode and test meter.
a
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Mercury 8.2 MAG Specifications

General

Brand	Mercury
Model	8.2 MAG
Category	Engine
Language	English