Test With The Diode Trio Installed; Test With Diode Trio Removed - Jeep 1987 Wrangler Workshop Manual

Test with the Diode Trio installed
Before removing the diode trio, connect an
ohmmeter, with the lowest range scale selected,
from the brush holder clip, to rear housing (A)
and note the resistance.
With the ohmmeter on its lowest scale, connect
between the rear housing and the diode trio (B).
For both meter readings reverse the test probe
connections. If both indications are zero, inspect
for a shorted brush holder clip caused by
absence of the insulating washer/sleeve around
the screws or damaged insulation.
Remove the screws to inspect the insulating
washers/sleeves (A).
If insulator assemblies are correct and both
ohmmeter observations are identical, replace
the voltage regulator.
A
B
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84914A
Test with Diode Trio Removed
Remove the diode trio from the rear housing
assembly.
Use an ohmmeter having 1 Vi volt cell for the
test. Touch one test probe to the brush terminal
(A) and the other probe to one of the stator
winding terminals (B).
Observe the resistance on the lowest range
scale.
Reverse the probes at the same two terminals.
Replace the diode trio if both resistances are
identical. The good diode trio will have one high
and one low resistance.
S E E
I . S .
N
O
T
E
S
84915A
Repeat the procedure for each stator winding
terminal of the diode trio.
Connect the ohmmeter test probes to any two
stator winding terminals. If the resistance is
zero, a shorted diode is indicated. Replace the
diode trio. Repeat the test for each combination
of stator winding terminals.
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