Component Component TTroubleshootingroubleshooting
Alternator.Alternator. The alternator provides 13.8 - 14.4The alternator provides 13.8 - 14.4
VDC at 100 amps of power for the electrical sys-VDC at 100 amps of power for the electrical sys-
tem and trickle charges the battery when thetem and trickle charges the battery when the
engine is being opeengine is being operated. rated. When the alterWhen the alternator isnator is
started, it will output 6 VDC to a relay (K3), ener-started, it will output 6 VDC to a relay (K3), ener-
gizing the relay and taking away the ground fromgizing the relay and taking away the ground from
the Battery light (DS3the Battery light (DS3,,Illustration 6-16) on theIllustration 6-16) on the
instruminstrument ent panel.panel.
The most effective way to troubleshoot an alterna-The most effective way to troubleshoot an alterna-
tor is with an ammeter on the output of the alter-tor is with an ammeter on the output of the alter-
natornator. . Another good check iAnother good check is with a volts with a voltmetermeter
across the battacross the batteryery. . With the engine operWith the engine operating at aating at a
moderate speed, the voltmeter reading shouldmoderate speed, the voltmeter reading should
never exceed 1never exceed 15.5 VDC. 5.5 VDC. If reading exIf reading exceeds 15.5ceeds 15.5
VDC, the alternator is defective and requiresVDC, the alternator is defective and requires
replacing. replacing. Should the alShould the alternator ternator output dropoutput drop
below 12 VDC, the alternator is defective andbelow 12 VDC, the alternator is defective and
requires requires replacireplacing.ng.
Perform the following procedures below for abnor-Perform the following procedures below for abnor-
mal charging system operation.mal charging system operation.
1. 1. Insure Insure that the that the undercharged undercharged condition condition (below(below
12 VDC) has not been caused by accessories12 VDC) has not been caused by accessories
having been left on for extended periods ofhaving been left on for extended periods of
time.time.
2. 2. ChecCheck the drivk the drive belt for prope belt for proper tenser tension (reion (refer tofer to
Alternator Drive Belt TensionAlternator Drive Belt TensionininSection 1Section 1).).
3. 3. EnsurEnsure that bate that battery itery is good and cs good and capablapable ofe of
holding a charge.holding a charge.
4. 4. InspInspect tect the wihe wiring ring for defor defectfects. s. ChecCheck all k all con-con-
nections for tightness and cleanliness, includ-nections for tightness and cleanliness, includ-
ing the slip connectors at the alternator anding the slip connectors at the alternator and
connections at connections at the the batterybattery..
5. 5. WitWith the ignih the ignition swtion switcitch on and all wirh on and all wiring haring har--
ness leads connected, connect a voltmeterness leads connected, connect a voltmeter
from:from:
a. a. alternator alternator “BA“BAT” teT” terminal rminal to groundto ground
b. b. altealternatrnator #1 teor #1 termrminal tinal to grouo groundnd
c. c. altealternatrnator #2 teor #2 termrminal inal to groto groundund
An An infinity infinity reading reading indicates indicates an an open open circuitcircuit
between the voltmeter connection and bat-between the voltmeter connection and bat-
terytery. . Repair iRepair if requiref required.d.
6. 6. With alWith all accesl accessories sories turned ofturned off, connecf, connect a voltt a volt--
meter acrmeter across the batteryoss the battery. . Operate engine atOperate engine at
modemoderate sperate speed. ed. If voltIf voltage is 15.5 VDC orage is 15.5 VDC or
higher, replace the alternator.higher, replace the alternator.
Circuit Breakers.Circuit Breakers. Circuit breakers are employedCircuit breakers are employed
in the electrical system and act similar to fuses,in the electrical system and act similar to fuses,
protecting the electrical circuits and valuable com-protecting the electrical circuits and valuable com-
ponents from overloads which could damageponents from overloads which could damage
them. them. Perform tPerform the followihe following troubleshooting troubleshooting pro-ng pro-
cedures to troubleshoot a circuit breaker.cedures to troubleshoot a circuit breaker.
1. 1. TurTurn the ignitn the ignition key ion key to the “to the “Ignition” Ignition” position.position.
2. 2. If the cirIf the circuit breakcuit breaker is trer is tripped, reset ipped, reset the circthe circuituit
breaker.breaker.
3. 3. If the cIf the circuit ircuit breaker breaker immediimmediately rately retrips,etrips,
remove all wires from the output side (loadremove all wires from the output side (load
side) of the circuit breaker.side) of the circuit breaker.
4. 4. ResReset the ciet the circurcuit breait breakerker. . If the ciIf the circurcuit breit breakeraker
retrips, the circuit breaker is bad and must beretrips, the circuit breaker is bad and must be
replaced.replaced.
5. 5. If the cirIf the circuicuit breakt breaker mainer maintaitains a set state, onns a set state, onee
of the output circof the output circuits is suits is shorted. horted. ReconnectReconnect
the wires one by one to the output side (loadthe wires one by one to the output side (load
side) until the cirside) until the circuit breaker trcuit breaker trips. ips. TrTrouble-ouble-
shoot the circuit of the wire, that tripped theshoot the circuit of the wire, that tripped the
circucircuit breaker, for it breaker, for a a short.short.
6. 6. IsolIsolate and remoate and remove the shorve the short from tht from the circe circuit.uit.
Automatic 90 amp Circuit BreakerAutomatic 90 amp Circuit Breaker(Illustration(Illustration
1-5)1-5).. The automatic circuit breaker (CB1) isThe automatic circuit breaker (CB1) is
located on the right slocated on the right side of engine. ide of engine. It will autIt will automat-omat-
ically rically reset itself if ieset itself if it trips. t trips. If the circuiIf the circuit breakert breaker
cannot maintain a set state, perform the followingcannot maintain a set state, perform the following
troubleshooting procedures to troubleshoot thetroubleshooting procedures to troubleshoot the
automatic circuit breaker.automatic circuit breaker.
1. 1. TTurn the igurn the ignitinition key to the Ofon key to the Off posif positiontion..
2. 2. RemRemove all wove all wireires from ts from the output she output side (lide (loadoad
side) of the circuit breaker.side) of the circuit breaker.
3. 3. TurTurn the ignitn the ignition key ion key to the “to the “Ignition” Ignition” position.position.
If the circuit breaker retrips, the circuit breakerIf the circuit breaker retrips, the circuit breaker
is bad and must be replaced.is bad and must be replaced.
4. 4. If the cirIf the circuicuit breakt breaker mainer maintaitains a set state, onns a set state, onee
of the output circof the output circuits is suits is shorted. horted. ReconnectReconnect
the wires one by one to the output side (loadthe wires one by one to the output side (load
side) until the cirside) until the circuit breaker trcuit breaker trips. ips. TrTrouble-ouble-
shoot the circuit of the wire, that tripped theshoot the circuit of the wire, that tripped the
circucircuit breaker, for it breaker, for a a short.short.
5. 5. IsolIsolate and remoate and remove the shorve the short from tht from the circe circuit.uit.
Single-Single-Pole, Single-ThPole, Single-Throw 30 row 30 amp Relaysamp Relays
(Illustration 6-4)(Illustration 6-4).. A relay is nothing more than anA relay is nothing more than an
electrielectrically contrcally controlled switcolled switch. h. Relays are alwaysRelays are always
shown on electrical circuits in a de-energizedshown on electrical circuits in a de-energized
state. state. The internal sThe internal switch, cwitch, common at pin 30,ommon at pin 30,
To Next Page
Loading...