TROUBLESHOOTING AND ELECTRICAL SYSTEM
Test Procedures
Page 11-16
2005 FE290 Gasoline Vehicle Maintenance and Service Supplement
11
A
Test Procedure 8 – Starter/Generator (Starter Function), Continued:
3. Disconnect the wires from all the terminals on the starter/generator. Then place the black (–) probe of a
multimeter, set to 200 (ohms), on the starter/generator housing (scratch through the paint to ensure a
good ground). While holding the black (–) probe against the housing, place the red (+) probe (one at a
time) on the A1, A2, F1, F2 and DF terminals respectively
(Figure 11-12, Page 11-16)
. The readings
should be no continuity. If the readings are incorrect, the starter/generator will need to be removed from
the vehicle and disassembled by a qualified technician.
See Starter/Generator Removal, Section 12,
Page 12-1.
-
An incorrect reading from A1 or A2 terminal indicates three possible problems: 1) a grounded A1 or
A2 terminal, 2) a grounded wire in the brush area, or 3) a grounded armature/commutator.
-
If the F1 or F2 reading is incorrect, it indicates a possible grounded F1 or F2 terminal or a grounded
field coil.
-
If the DF reading is incorrect, it indicates a possible grounded DF terminal or a grounded field coil.
4. Disconnect the ground wire from the A2 terminal and the green wire from the A1 terminal on the starter/
generator.
5. Using a multimeter set to 200 (ohms), place the red (+) probe on the A1 terminal and the black (–) probe
on the A2 terminal. The reading should be continuity. If the reading is incorrect, a possible open or poor
contact in a brush assembly and/or open armature windings may be the cause. The starter/generator will
need to be removed from the vehicle and disassembled by a qualified technician.
See Starter/Generator
Removal, Section 12, Page 12-1.
6. With the wires still disconnected, using a multimeter set on 200 (ohms), place the red (+) probe on the
F1 terminal and the black (–) probe on the F2 terminal. The reading should be between approximately
0.1 and 0.3 (ohms). If the reading is incorrect, a possible open field coil or bad connections at terminals
may be the cause. The starter/generator will need to be removed from the vehicle and disassembled by
a qualified technician.
See Starter/Generator Removal, Section 12, Page 12-1.
7. With the wires still disconnected, using a multimeter set on 200 (ohms), place the red (+) probe on the
DF terminal and the black (–) probe on the F1 terminal. The reading should be between 4.5 and 5.5
(ohms).If the reading is incorrect, a possible grounded DF terminal and/or grounded field coil may be the
cause. The starter/generator will need to be removed from the vehicle and disassembled by a qualified
technician.
See Starter/Generator Removal, Section 12, Page 12-1.
Figure 11-12 Check Terminal Continuity
2m
20
m
200
m
2k
200
200
200
200
20
2
200
m
500
20k
200k
2000
k
1000
OFF
WAVETEK
5XL
V
V
V
A
!
!
COM
200mA
MAX
1000 ---
750V
FUSED
F2
DF
F1
A2
A1
YELLOW WIRE
STARTER /
GENERATOR
