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ROTATING RECTIFIER TEST
NOTICE
Before performing the continuity test, all lead wires
(Figure 48) must be disconnected from the rectifier.
The rotating rectifier is connected to both the main field
and exciter armature and is mounted on the exciter stator
armature.
Be sure to place the selection dial on the multimeter in
the diode position. Sometimes referenced as the diode
feature test.
Place the positive lead from the multimeter on the
POSTIVE
(+) terminal of the rectifier (Figure 48). Now touch
the U, V and W terminals one at a time with the NEGATIVE
(–) lead. Each terminal should give a continuity reading.
RANGE
TURN
SELECTION
mV
DIAL TO Ω POSITION
V
SELECT
ICON
V
Hz
OFF
10 A
Figure 48. Rotating Rectifier Check (Positive)
Reverse the multimeter leads. Place the NEGATIVE lead
of the multimeter on the DC Positive (+) terminal of the
rectifier (Figure 49) and touch U, V and W terminals with
the positive lead. This should cause the multimeter to read
open circuit.
NOTICEa
If the rotating rectifier fails any of the tests as referenced
in Figure 48 or Figure 49, replace the rectifier.
GENERATOR SERVICE AND TROUBLESHOOTING MANUAL — REV. #0 (08/29/23) — PAGE 45
MULTIMETER
NEGATIVE
LEAD
0
Auto
600
MIN MAX
REL
Hz %
HOLD/LIGHT
Hz
C
F
ROTATING
uA
mA
RECTIFIER
A
mAµA COM
MAX
W
V
U
POSITIVE
LEAD
ROTATING RECTIFIER TEST
OPEN
CIRCUIT
TURN
SELECTION
DIAL TO Ω POSITION
SELECT
ICON
DC
Figure 49. Rotating Rectifier Check (Negative)
SURGE PROTECTOR CHECK (DCA125-150)
NOTICE
Before performing the continuity check, both surge
protector lead wires (Figure 50) must be disconnected
from the rotating rectifier.
Place the selection dial on the multimeter in the Ω position.
Next, place the multimeter leads across the surge protector
as shown in Figure 50 and verify that the meter displays an
open circuit. If the meter indicates continuity or another
reading, replace the surge protector.
MULTIMETER
0
TURN
RANGE
SELECTION
HOLD/LIGHT
DIAL TO Ω
POSITION
mV
V
V
Hz
OFF
10 A
MAX
Figure 50. Surge Protector Check
MULTIMETER
POSITICE
LEAD
0
Auto
600
RANGE
MIN MAX
REL
Hz %
HOLD/LIGHT
Hz
C
F
mV
uA
mA
V
V
Hz
A
OFF
mAµA COM
10 A
MAX
NEGATIVE
LEAD
SURGE
PROTECTOR
OPEN
CIRCUIT
Auto
600
MIN MAX
REL
Hz %
Hz
C
F
uA
mA
A
mAµA COM
ROTATING
RECTIFIER
ROTATING
RECTIFIER
W
V
U
UNSOLDER
LEADS
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