Westerbeke 7.0 KW BGC -60Hz Technical Manual page 143

To test the bridge rectifier, if it is believed
to be faulty, follow the test directions
below.
a. Set the ohmmeter scale on RX1
( +
DC). Set the meter to zero.
b. Connect the positive (
+ )
lead from
the meter to point #4. With the
negative (-) lead from the meter,
momentarily contact points #1, #2,
#3 and #5. The needle should not
move, showing infinite resistance.
c. Remove the positive (+) lead from
point #4 and connect the negative
(-) lead to point #4, and with the
positive (+) lead from the meter
momentarily touch points #1, #2
and #3. The needle should deflect
showing passage through the
diodes in the rectifier.
d. With then negative (-) lead still at-
Point
(15
(Rectifier Kountine Hole)
"1-_-
Point
(13
Note: Some ohmmeters will reverse steps band c.
tached to point #4, touch point #5 with the positive (
+ )
lead. The needle should not deflect.
e. Place the positive (+) lead of the meter on point #1 and the negative (-) lead on point #3. The needle
should not deflect (infinite resistance). Reverse the leads to #1 and #3. Again there should be no
deflection If the rectifier fails any of the above tests (a through e), the rectifier is defective and
should be replaced.
NOTE: Some ohmmeter models have internally differing polarities between their red and black leads.
The test results above may read the opposite to your meter when performing above tests with meter
needle deflection.
139
Westerbeke Generators