32
VOLTAGE
OUTPUT
TEST
CHAPTER
TWO
35A
ALTERNATOR
55A
ALTERNATOR
If
the reading varies or
if
no reading is obtained, check for
poor connections or damaged wiring.
6. Tum the key switch ON. Run the engine from idle up
to 2,500 rpm and note the voltmeter reading.
If
the volt-
meter does not indicate 14.2-14.8 volts, remove the alter-
nator and have it bench tested by a dealership or qualified
specialist.
Alternator
Current
Output
Test
This test checks the current output
of
the alternator. All
wires connected to the alternator for normal operation
must be connected. Refer to Figure 7 for this procedure.
1. Check the alternator drive belt tension. See Chapter
Three.
2. Disconnect the negative battery cable.
3. Disconnect the wire from the BAT terminal on the al-
ternator.
4. Connect the positive lead
of
a 0-100 amp DC ammeter
to the BAT terminal and the negative lead to the discon-
nected wire.
5. Reconnect the negative battery cable.
6. Make sure the engine control is in the stop position.
7. Tum on all accessories and crank the engine for 15-20
seconds to remove any surface charge from the battery.
8. Tum
off
all accessories.
9. Connect a tachometer to the engine. Connect a carbon
pile load device to the battery terminals.
10. Start the engine and run at 2,500 rpm. Adjust the car-
bon pile to obtain maximum alternator output. The amme-
ter should read the rated amperage according to the
alternator model identified on the data plate on the alter-
nator (Figure 8). Model LR135 alternators should pro-
duce 35 amps, and model
LRl55
alternators should
produce 55 amps.
FUEL
SYSTEM
Refer to Chapter Seven for a description
of
fuel system
operation. A diagram
of
a typical fuel system is shown in
Figure 9.
Be aware that diesel fuel injection systems require clean
fuel that meets the fuel requirements specified by the en-
gine manufacturer. Many fuel problems are a result
of
contaminated fuel or fuel not approved by the engine
manufacturer. Refer to Chapter Three.
NOTE
Engine components outside the
fuel
system
can also cause some
of
thefollowing engine
symptoms. Be sure to check other engine
components that can also cause the symp-
toms.
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