Onan NHC Series Operator's/Service Manual And Parts Catalog page 298

TABLE 3. TESTING PHELON 15 AMP SYSTEM
BASIC TEST
PROCEDURE j
TEST VALUES
1. Battery
Battery Voltage - unit not running
12 VDC
2. Regulator
Battery Voltage after unit is
running 3 to 5 minutes
13.6 to 14.7 VDC
3. Alternator
Stator and
Wiring with
Fully Charged
battery.
Ohmmeter reading from
stator output - unit not running.
Check at plug.
.11 to .19 Ohms
4. Alternator
and Wiring
Measure AC open circuit stator
voltage with unit running. Measure
between two stator leads with
plug disconnected and unit
running at approximately 3600 rpm.
28 VAC
V O L T A G E
R E G U L A T O R
R E C T I F I E R
V A C U - F L O F L Y W H E E L
6 M A G N E T S PRESSED I N T O
F L Y W H E E L ( N O T R E M O V A B L E )
FIGURE 30. 15 AMP SYSTEM (PHELON)
VR I
High Charging Rate Test: Perform this test as follows:
1. Check B+ to ground voltage with a DC voltmeter.
2. If voltmeter reads over 14.7 volts, replace
regulator-rectifier assembly.
3. If reading is under 14.7 volts the system is
probably okay. Recheck the battery and connec-
tions. If the battery does have a low charge, but
accepts recharging, system is okay.
MOUNTED BEHIND
BLOWER WHEEL
WHITE
WHITE
T O B A T T E R Y
29
C A U T I O N !
REGULATOR'MUST BE GROUNDED
THROUGH MOUNTING BOLTS
FIGURE 31. 15 AMP PHELON SYSTEM
9 0 2 3 9 5