Battery Charger
Page 10
Troubleshooting
SCR Assembly
Test:
Perform the test setup before starting this procedure.
1. The test light should be OFF. If the light is ON then one of
the SCR’s is shorted. Skip ahead to Gate Test.
2. Momentarily touch the resistor to one of the gate terminals.
3. The test light should turn ON and stay ON when the resistor
is removed. The voltmeter should read 0.88 volts (nominal).
If the light does not turn ON then the SCR has failed. Skip
ahead to Gate Test.
4. Disconnect then reconnect the battery and repeat the test
on the other SCR.
Gate Test:
This test should only be performed if it has been determined
that one of the SCR’s have failed.
Perform the following on BOTH SCR’s.
1. Disconnect the 12 volt battery and all test leads.
2. Measure the resistance from the SCR Anode terminal (+)
to the Gate terminal (-).
3. The resistance should be high, around 15 meg Ohms.
4. If the reading is low, then the gate is shorted. If the gate
has shorted on either SCR, then it is likely that the control
board has been damaged and must also be replaced.
Note: Both SCR’s must be replaced as a set.
Note: This test passes current through the transformer
and fuse. Confirm both the transformer and fuse are
good before continuing.
Tools required for this test:
12 volt battery, Test light, Volt meter, 300 Ohm resistor.
Test Setup:
1. Remove the charger form the vehicle.
2. Remove the charger cover.
3. Disconnect the Gate wires from both SCR’s.
Note: The other wires are soldered and cannot be removed.
4. Disconnect the control board J1 connector.
5. Connect the 12 volt battery positive to the charger DC
output Black wire.
Connect one lead of the resistor to the 12 volt battery
positive. The resistor should be on a wire long enough to
reach the SCR’s.’
6. Connect the 12 volt battery negative to one of the test light
leads.
7. Connect the other test light lead to the charger DC output
Red wire.
8. Connect a voltmeter to the charger Black and Red output
wires.
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