CAPACITOR TEST
The capacitor should charge when you use an ohmmeter on the high ohms scale with the proper polarity. The resistance will increase until it goes to (nearly) infinity. If the capacitor is shorted, then it will never charge. If it is open, the resistance will be infinite immediately and won't change. If the polarity of the probes is reversed, it will not charge properly either. Determine the polarity of your meter and mark it. Black is usually negative with VOMs, for example. Confirm with a marked diode. A low reading across a good diode indicates that the positive lead is on the anode (triangle) and negative lead is on the cathode (bar).
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 battery voltage on the red wire to operate. Before proceeding, make sure battery voltage is at the connector red wire when key is ON.
Test Procedure
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 approximately 50 A. Refer to engine wiring diagram.
Fluke1 model 334 or 336, Snap-On1 model MT110 or EETA501, and various other amp meters should be available through local tool suppliers.
Reconnect the outboard’s battery cables.
