Digital Multimeter And Mercathode Reference Tester 76675A1 View - Mercury BRAVO Service Manual

CORROSION PROTECTION - ALL MODELS
The MerCathode Reference Electrode Tester 76675A1 is equipped with a special jack con-
taining a resistor to provide the proper scale reading when used with a digital multimeter.
Do NOT remove this plug or use analog meters. Resistor jack can be left in place when
using digital meters.
NOTE: Set-up test equipment as shown on page 7A-21.
IMPORTANT: Be sure to observe the following when performing test:
•
•
•
1. Plug negative meter lead into negative (–) receptacle of meter. Connect other end of
2. Plug Reference Electrode Tester lead into positive (+) receptacle of meter.
3. Set meter on scale required to read 0-2000 millivolts (0-2 volts).
Page 7A-16
Digital Multimeter and MerCathode Reference Tester 76675A1
a - Special Resistor Jack
If equipped with MerCathode System, ensure battery is fully charged (12.6 Volts or
above).
Boats recently placed in service usually will produce a reading higher than normal
because the sterndrive unit is protected by a good finish and new sacrificial anodes.
To obtain an accurate diagnosis, the test should be performed after the boat has
been in service at least one or two weeks. This will give the paint a chance to soak
and minor abrasions and scratches will have appeared resulting in a more accurate
reading.
Boats should be moored, without being operated, for at least 8 hours before perform-
ing tests. This is necessary to allow the MerCathode System and/or sacrificial
anodes to polarize the surrounding water. Be careful not to rock the boat excessively
while boarding to perform a test as this will alter the test reading.
lead to negative (–) battery terminal or other convenient engine ground.
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a
SERVICE MANUAL NUMBER 28
76834
90-863160 MAY 2000