Recreational Vehicle Generator Diagnostic Repair Manual
Section 7
DIAGNOSTIC TESTS
AC POWER WINDING RESISTANCE * RV45 (Model 5410/5411)
ACROSS WIRES: OHMS
11 & 22 0.396Ω
11S & 22S
0.396Ω
33 & 44
0.396Ω
AC POWER WINDING RESISTANCE * RV55 (Model 5412/5413)
ACROSS WIRES: OHMS
11 & 22
0.28Ω − 0.32Ω
11S & 22S 0.28Ω − 0.32Ω
33 & 44 0.28Ω − 0.32Ω
AC POWER WINDING RESISTANCE * RV65 (Model 5414/5415)
ACROSS WIRES: OHMS
11 & 22
0.209Ω − 0.242Ω
11S & 22S 0.209Ω − 0.242Ω
33 & 44 0.209Ω − 0.242Ω
* Resistance values In ohms at 20° C. (68° F.).
Actual readings may vary depending on ambient
temperature. A tolerance of plus or minus 5% is
allowed.
8. Now, set the VOM to its “Rx1 K” or “Rx10,000”
scale and zero the meter.
9. Connect the meter test leads across Stator lead
11 and frame ground. “Infinity” should be read.
10. Connect the meter test leads across Stator lead
33 and frame ground. The reading should be
“Infinity”.
11. Connect the meter test leads across Stator leads
Wire 11 and Wire 33. The reading should be
“Infinity”.
12. Connect the meter test leads across Stator
leads Wire 11 and Wire 2. The reading should be
“Infinity”.
13. Connect the meter test leads across Stator
leads Wire 33 and Wire 2. The reading should be
“Infinity”.
RESULTS:
1. If the Stator passes all steps except Step 7,
repair, re-connect or replace Sensing leads 11S
and 22S.
2. Replace the Stator if it’s power windings fail the
test. (Note Result No. 1).
3. If the Power Windings test good, perform the
“Insulation Resistance Test” on Page 13.
11 33
44
CB2
CB1
BLACKRED
11S 22S 22
Figure 7-9. – Stator Power Winding Leads
TEST 8 – CHECK BRUSH LEADS
DISCUSSION:
In Test 4, if application of battery voltage to the Rotor
did NOT result in an output of about one-half rated
voltage, the brush leads could be one possible cause
of the problem. This test will check Wires 4 and 0 for
an open circuit condition.
PROCEDURE:
1. Set a VOM to its “Rx1” scale and zero the meter.
2. Disconnect Wire 4 from the Voltage Regulator and
from the Rotor brush terminal.
3. Connect the VOM test leads across each end of
the wire. The meter should read “Continuity”.
4. Disconnect Wire 0 from the Rotor Brush Terminal.
Connect one meter test lead to Wire 0. Connect
the other test lead to a clean frame ground. The
meter should read “Continuity”.
RESULTS:
1. Repair, reconnect or replace any defective wire(s).
2. If wires check good, go to Test 9.
Page 41