Charging System Tests; 12 V Charging Circuit - Evinrude E-TEC 200 Service Manual

CHARGING SYSTEM
TESTS

12 V Charging Circuit

To test the operation of the regulator in the EMM,
you must be able to run the outboard continuously
at approximately 5000 RPM, such as in a test tank
or on a marine dynamometer.
The test consists of monitoring the system's
response to a partially discharged battery. Use a
variable load tester to discharge the battery.
IMPORTANT:
The regulator requires voltage to
operate. Before proceeding, make sure there is at
least 7 V on the positive terminal of the starter
solenoid.
Disconnect the battery cables at the battery.
Use an inductive amp meter or connect a 0 to
50 A ammeter in series between the red wire(s) of
engine wire harness (alternator output from EMM)
and the positive (B+) battery cable terminal of
starter solenoid.
IMPORTANT:
This outboard has dual output
charging. Each output is isolated and regulated.
Each output is 25 A. Combined output is approxi-
mately 50 A. Refer to engine wiring diagram.
†
Fluke model 334 or 336, Snap-On
or EETA501, and various other amp meters
should be available through local tool suppliers.
Reconnect the battery cables.
Following the manufacturer's directions, connect
the variable load tester (carbon pile) across the
battery terminals. Stevens model LB-85 and
Snap-On model MT540D are examples of testers
available.
WARNING
Excessive battery discharge rates might
overheat battery causing electrolyte gas-
sing. This might create an explosive atmo-
sphere. Always work in a well ventilated
area.
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2
Variable Load Test Diagram
1. Red wires (alternator output from EMM)
2. Starter solenoid
3. Battery cable terminal (B+)
4. Variable load tester
5. Ammeter
Start and run the outboard at approximately 3500
RPM. Use the variable load tester to draw the bat-
tery down at a rate equivalent to the stator's full
output.
•
The ammeter should indicate nearly full output,
approximately 50 A (or 25 A for each output)
between 2000 and 4000 RPM.
•
Above 4000 RPM, charging output is reduced to
40 A.
†
model MT110
Battery Charging Graph
Decrease the battery load toward 0 A.
•
Ammeter should show a reduced output. As the
current draw decreases, the battery voltage
should stabilize at approximately 14.5 V.
•
If results vary, check stator BEFORE replacing
the EMM. See STATOR TESTS on p. 96.
ELECTRICAL AND IGNITION

CHARGING SYSTEM TESTS

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