Club Car Carryall 1500 Maintenance And Service Manual page 199

TROUBLESHOOTING AND ELECTRICAL SYSTEM:
DIESEL VEHICLES
TEST PROCEDURE 12 – Wire Harness Diodes
See General Warnings, Section 1, Page 1-2.
A diode is designed to conduct current in one direction only. Depending on the application, diodes are used in the
vehicle to control electrical system logic, or to help protect relay and switch contacts from excessive arcing. See
following NOTE.
NOTE: If a diode conducts current in both directions, the diode has failed closed. If a diode will not conduct current in
either direction, the diode has failed open (Figure 12-20, Page 12-23).
WAVETEK 5XL
V V
OFF
1000 500
200 200
20 200
2m
4 2
200
20
m
m
200
2000
m
k
200k
20k 200
A
2k
1
V ! COM ! 200nA
MAX
1000 ---
750V FUSED
WAVETEK 5XL
V OFF V
1000 500
200 200
20
200
5
2 2m
200
m 20
m
200
2000
k m
200k
20k 200
2k A
2
!
V ! COM 200nA
MAX
1000 ---
FUSED
750V
WAVETEK 5XL
1
V OFF V
1000
500
200
200
20 200
6
2 2m
200
m 20
m
200
2000
k m
200k
20k 200
2k A
2
! !
V COM 200nA
MAX
1000 ---
FUSED
750V
1. VOM Black Lead 2. VOM Red Lead 3. Wiring Diagram Symbol
with Diode Stripe Orientation 4. Good Diode (Probe Scenario A) -
Conducts Current and Shows Continuity 5. Good Diode (Probe
Scenario B) - No Continuity 6. Bad Diode - Meter Beeps In Either
Direction (Probe Scenarios A and B)
1127
Figure 12-20 Basic Diode Information
The wire harness is equipped with several in-line diodes. The following table describes each diode's function in the
electrical system, the location in the wire harness, and the symptom(s) of a diode failure.
DIODE TROUBLESHOOTING GUIDE
IN-LINE WIRE
DIODE LOCATION
(WIRES)
Diode 1 w32 and w35
TABLE CONTINUED ON NEXT PAGE
A
2
3
( )
B
1
2
1
FUNCTION
Differential solenoid coil flyback diode
2015 Carryall 1500/1700 and XRT 1550 Maintenance and Service Manual
Test Procedures
FAILURE
SYMPTOM/COMMENT
CONDITION
Will contribute to the premature failure
Open
of the differential limit switch contacts.
With key switch ON, the 30-amp fuse
Closed (on w125) will blow repeatedly until the
diode has been replaced.
12
Page 12-23