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Section 1.5
COMPONENTS TESTING
7.Connect one test lead to Stator lead PS1, the
other to Stator lead 77. The VOM should read
"infinity".
8.Connect one VOM test lead to Stator lead TIM1,
the other test lead to Stator lead 77. "Infinity"
should be Indicated.
TESTING THE BATTERY CHARGE CIRCUIT
GENERAL:
The Stator is equipped with dual battery charge wind-
ings. These windings deliver an AC output to a
Battery Charge Rectifier (BCR) which rectifies it
(changes it to direct current or DC). The direct current
is delivered to the unit battery, to maintain the battery
in a charged state while the unit is running.
Figure 3. Battery Charge Windings and Rectifier
SYMPTOMS OF CIRCUIT FAILURE:
It is difficult to determine if the battery charge circuit is
operating without testing for correct voltage. If you
suspect the battery charge circuit Is defective, the fol-
lowing symptoms will usually point to a cause of the
problem. See Figure 4.
1. If no AC voltage can be measured across Stator connections at
the Battery Charge Rectifier (BCR), an open circuit condition
probably exists in Wire 66 (Brown), or Wire 77 (Brown).
2. If AC voltage (s available to the Wire 66 and 77 terminals at the
battery Charge Rectifier, but no voltage or a low voltage is mea-
sured between the BCR's Wire 55 terminal and ground, the
Battery Charge Rectifier (BCR) is defective.
Figure 4. Battery Charge Circuit
TESTING THE BATTERY CHARGE CIRCUIT:
Test the Battery Charge winding as follows:
1. Disconnect Wire 77 at the Battery Charge Rectifier (BCR).
2. Disconnect Stator output Wire 66 at the Battery Charge
Rectifier (BCR).
3. Disconnect Wire 55.
4. Set a VOM to its "Rx1 " scale and zero the meter.
5. Connect the VOM test leads across Wires 77 and 55, then
across Wires 66 and 55. Note the resistance reading in both
cases. Replace Stator Assembly, if defective.
BATTERY CHARGE WINDING RESISTANCE
ACROSS WIRES 66 TO 55 = 0.095-0.108 Ohm
ACROSS WIRES 77 TO 55 = 0.095-0.108 Ohm
6. Use a VOM to measure AC voltage at the Wires 66 and 77 ter-
minals of the Battery Charge Rectifier, with the unit running. If
no AC voltage is measured, an open circuit exists in the wire
66 or 77 circuit.
7. With engine running, use a VOM to check for DC voltage
between the Battery Charge Rectifiers Wire 55 and frame
ground. If AC voltage was present in step 6, but DC voltage is
NOT present in this step, the Battery Charge Rectifier (BCR) is
defective.
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