switswitch (S5). ch (S5). Heater swiHeater switch (S5) is powertch (S5) is powered by cir-ed by cir-
cuit breakcuit breaker (CB8). er (CB8). There is a diode betweeThere is a diode between cir-n cir-
cuit breakcuit breaker (CB8) and heater ser (CB8) and heater switcwitch (S5). h (S5). Its pur-Its pur-
pose is to prevent an induced voltage generatedpose is to prevent an induced voltage generated
by the heater fan motor (B5), which could prolongby the heater fan motor (B5), which could prolong
engine shut down, after the ignition switch (S1) isengine shut down, after the ignition switch (S1) is
turned to the Off posturned to the Off position. ition. With the heater sWith the heater switcwitchh
(S5) in the Low / High position, 12 VDC will be(S5) in the Low / High position, 12 VDC will be
present on wire #43 to the heater fan motor (B5)present on wire #43 to the heater fan motor (B5)
for low speed operfor low speed operation. ation. With the heater sWith the heater switchwitch
(S5) in the High position, 12 VDC will be present(S5) in the High position, 12 VDC will be present
on wire #44 to the heater fan motor (B5) for highon wire #44 to the heater fan motor (B5) for high
speed operatispeed operation. on. The heater fan mThe heater fan motor (B5) otor (B5) isis
connected to the chasconnected to the chassis ground by wisis ground by wire #11. re #11. TheThe
heater fan motor (B5) will circulate air through aheater fan motor (B5) will circulate air through a
heater coil (which is heated by the engine coolant)heater coil (which is heated by the engine coolant)
and into the cab.and into the cab.
Air ConditAir Conditioner / ioner / Heater UnitHeater Unit(B7, Illustration(B7, Illustration
6-16)6-16).. The air conditioner / heater unit (B7) isThe air conditioner / heater unit (B7) is
powered by circpowered by circuit breaker (Cuit breaker (CB16). B16). TTwo powerwo power
wires #72 are sent from the circuit breaker (CB16)wires #72 are sent from the circuit breaker (CB16)
to the air conditito the air conditioner / heater unit (B7)oner / heater unit (B7). . This isThis is
required to deliver the sufficient amperage to therequired to deliver the sufficient amperage to the
air conditiair conditioner / heateroner / heater. . All controlAll controls to the air con-s to the air con-
ditioner / heater unit (B7) are internal to the airditioner / heater unit (B7) are internal to the air
conditioner / heater unit (refer toconditioner / heater unit (refer toSection 20ASection 20Aforfor
additional information on the air conditioner / heat-additional information on the air conditioner / heat-
er unit).er unit).
Forward AlarmForward Alarm(LS4, Illustrations 6-16, 9C-2, and(LS4, Illustrations 6-16, 9C-2, and
29-30)29-30).. The forward alarm circuit is designed toThe forward alarm circuit is designed to
emit an audible alarm when the shifter is in theemit an audible alarm when the shifter is in the
forward position and the forward alarm circuit hasforward position and the forward alarm circuit has
been activated. been activated. The forward alarThe forward alarm circm circuit is con-uit is con-
trolled by two switches, the forward alarm keytrolled by two switches, the forward alarm key
switch (S14) and the forward alarm toggle switchswitch (S14) and the forward alarm toggle switch
(S10). (S10). The forwarThe forward alarm mode key sd alarm mode key switch (Switch (S14)14)
is an on and off swiis an on and off switch. tch. When the forwarWhen the forward alarmd alarm
mode key switch (S14) is in the Automatic Posi-mode key switch (S14) is in the Automatic Posi-
tion, the contaction, the contacts of the swits of the switch are clostch are closed. ed. WhenWhen
the forward alarm mode key switch (S14) is offthe forward alarm mode key switch (S14) is off
(Operator Controlled Mode), the contacts of the(Operator Controlled Mode), the contacts of the
switswitch are open. ch are open. With the forwWith the forward alarm mard alarm modeode
key switch (S14) turned to the Automatic Position,key switch (S14) turned to the Automatic Position,
the forward alarm (LS4) will always be energized,the forward alarm (LS4) will always be energized,
sounding an audible alarm any time the shifter issounding an audible alarm any time the shifter is
placed in the forwplaced in the forward positionard position. . With the forwWith the forwardard
alarm override switch (S14) turned to the Operatoralarm override switch (S14) turned to the Operator
Controlled position, the forward alarm toggleControlled position, the forward alarm toggle
switch (S10) can activate the forward alarm circuitswitch (S10) can activate the forward alarm circuit
when the shifter when the shifter is in the forwis in the forward position. ard position. ThisThis
allows the operator to determine when or whenallows the operator to determine when or when
not to use the forward alarm cinot to use the forward alarm circuit. rcuit. With the shiftWith the shift--
er in the forward position, 12 VDC is sent on wireer in the forward position, 12 VDC is sent on wire
#306 to pin 14 of forwa#306 to pin 14 of forward relrd relay (K17)ay (K17). . GrouGround tond to
enerenergizgize K17 is supplie K17 is supplied by either S1ed by either S10 or S14. 0 or S14. 1212
VDC is supplied by circuit breaker (CB19) at allVDC is supplied by circuit breaker (CB19) at all
timtimes to pin 9 (commes to pin 9 (common pin) of K17. on pin) of K17. When K17When K17
energizes, the 12 VDC at pin 9 will pass out pin 5energizes, the 12 VDC at pin 9 will pass out pin 5
to LS4 (forward alarm unit), energizing it.to LS4 (forward alarm unit), energizing it.
WARNING:WARNING:See the information in theSee the information in the
Operator’s GuideOperator’s GuideandandSafety CheckSafety Checkconcerningconcerning
selecting the selecting the approappropriate mode priate mode of operation.of operation.
Reverse AlarmReverse Alarm(LS3, (LS3, IllustIllustration 6-16ration 6-16). ). TheThe
reverse alarm circuit is designed to emit an audi-reverse alarm circuit is designed to emit an audi-
ble alarm when the shifter is in the reverse posi-ble alarm when the shifter is in the reverse posi-
tion. tion. The reverse alarThe reverse alarm circuim circuit is controllt is controlled by theed by the
shiftershifter. . With the shiftWith the shifter in the reverse positier in the reverse position,on,
relay (K18) is enerrelay (K18) is energized. gized. CircuiCircuit breaker (CB15)t breaker (CB15)
will supply 12 VDC to pin #30 of relay (K18).will supply 12 VDC to pin #30 of relay (K18).
When relay (K18) energizes, the 12 VDC presentWhen relay (K18) energizes, the 12 VDC present
at pin #30 will pass out pin #87 through wire #39,at pin #30 will pass out pin #87 through wire #39,
energizienergizing the reverse alarng the reverse alarm (LS3). m (LS3). Any time 12Any time 12
VDC is present on wire #319 at relay (K18), pinVDC is present on wire #319 at relay (K18), pin
#86, the reverse alarm (LS3) should be energized.#86, the reverse alarm (LS3) should be energized.
Refer to Illustration 6-16 for component referenceRefer to Illustration 6-16 for component reference
PPrroobblleem m CCaauusse e CCoorrrreeccttiioonn
1. 1. Eng Eng Oil Oil liglight ht (DS(DS1)1)
is illuminated.is illuminated.
1. 1. EnginEngine oil pe oil presressure isure is bels below 7 - 10ow 7 - 10
psi.psi.
2. 2. DefeDefectictive engive engine oil prne oil pressessureure
switch (S17).switch (S17).
3. 3. TherThere is a e is a shorshort on wt on wire ire #4.#4.
1. 1. RefeRefer to r to ProblProblem 36em 36. in t. in thehe
Engine TroubleshootingEngine Troubleshootingchart inchart in
Section 1Section 1..
2. 2. ReplReplace enace engine ogine oil pil presressursuree
switch (S17).switch (S17).
3. 3. IsolIsolate anate and repd repair air shorshort.t.
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