Onan T260G User Manual

With the engine running between 1800 to 2600 rpm, and from battery negative terminal to regulator-
observe the panel ammeter (if not already equipped, rectifier case.
If battery voltage remains low with
connect a test ammeter).
If no charging is evident, engine running, proceed to step 3.
proceed with the Alternator Output Test.
3. Disconnect plug from regulator-rectifier and test
the AC voltage at the plug with engine running near
3600 rpm.
If AC voltage reads more or less than
specified in Table
1, proceed to step 4. If AC voltage
is as specified but DC voltage is low, replace
ALTERNATOR OUTPUT TEST regulator-rectifier.
Use a volt-ohmmeter such as the Simpson 270, when
4. Use the
Rxl scale on the ohmmeter for detecting
testing the charging system.
opens in the stator (unit not running Disconnect
1. With the engine running, check the battery terminal
voltage (regulator output) using a DC voltmeter.
Voltage output should be within the values specified
in Table 1.
If voltage is greater than specified
replace regulator-rectifier assembly.
If voltage is
less than specified, proceed to step 2.
plug from regulator'-rectifier. Connect ohmmeter
test leads to wires coming from stator. Refer to
Table
1 for resistance specifications. If resistance is
not as specified, replace stator.
If stator resistance
readings are as specified and windings are not
shorted
to ground, low AC voltage may be due to
loss of magnetism If so, blower wheel assembly
2. Examine all wires for loose, corroded, broken
must be replaced Check for magnetism with steel
connections, short circuits, etc. Check fuses. Repair
tool blade. Next, connect one ohmmeter test lead to
as needed
to assure complete circuits from regulator-
stator wire, connect the other test lead
to ground. If
rectifier B+ terminal to battery positive terminal
the ohmmeter reading is low the stator is grounded
and must be replaced.
TABLE 1. TESTING 15- AND 20-AMPERE SYSTEMS
PROCEDURE-.
I
1. Battery Battery Voltage unit not running.
2. Regulator Battery Voltage after unit is running
3
to 5 minutes.
3. Alternator Stator
output unit not running.
and Wiring
Ohmmeter reading from stator
Check at plug.
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.
12 VDC
13.6 to 14.7 VDC
0.1 to 0.2 Ohms
40 VAC minimum
60 VAC maximum
12 VDC
13.6 to 14.7 VDC
0.3 to
0.5 Ohms
31 VAC minimum
51 VAC maximum

Onan T260G Specifications

General

Brand	Onan
Model	T260G
Category	Engine
Language	English