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Old 06-21-2010, 11:04 PM   #2
jiminpa
Gone Wild
 
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Join Date: Jun 2010
Location: Snowy NW PA
Posts: 275
Default Re: Can I ground the field to test the generator?

more info here...
I did the following tests. All test procedures indicate no problem with starter/generator.
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1. Place the neutral lock-out cam in the SERVICE position, put the forward and reverse lever in the NEUTRAL
position, and chock the wheels.
2. Check that wires are connected correctly and are tight. If they are not, rewire or tighten as necessary.
3. Disconnect the wires from all the terminals on the starter/generator. Then place the black (-) probe of a
multimeter, set to ohms (Ω), on the starter/generator housing (scratch through the paint to insure 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 12-25, Page 100). 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 Removal of the Starter/Generator,
Page 107).
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. Using a multimeter set to ohms (Ω), 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 maybe the cause. The starter/generator will need to be removed from the vehicle and disassembled
by a qualified technician (See Removal of the Starter/Generator, Page 107).
5. Disconnect the green wire from the F1 terminal and the white wire from the F2 terminal on the starter/
generator. Using a multimeter set on ohms (Ω), place the red (+) probe on the F1 terminal and the
black (-) probe on the F2 terminal. The reading should be continuity.
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 Removal of the Starter/Generator, Page 107).
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still looking for thoughts on grounding the field.
thanks,
jim
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