Jeep UNIVERSAL CJ-2A - Page 144

'.T eep ' UNIVERSAL and 'Jeep' DISPATCHER
I
movement of the shift yoke, however , t he ra nge of
a djustment is not sufficie ntly great to cause incor -
r ect eng agement of the pinion w ith the flywheel
ge
ar.
Th e lower sw itch contact plate is attac he d to t he
sta rtin g motor ho u sing with Nut . This nut mus t
be kept tig ht to pr ev ent exces siv e drop of voltage
at the sw i tch.
Later M odel CJ -3B, C] -5 and C J-6, and a ll M ode l
DJ-3 A startin g s wi tc hes are of t he soleno id typ e,
mou nt ed directly on the starting motors. This type
swi tch is energized by t urnin g the i gn iti on key to
t he extreme right posit io n. Should a s olenoid swit ch
fa il in service it is necessary to i ns tall a new as-
semb l y.
1-63. Ign it ion Sw it ch
The ignition switch se rv es b oth to e ner gi ze the
ig niti on system and engage the st a rter switch. With
t he ke y in t he vertical po si tion, t he ele ctrica l sys-
te m is OFF. Turning th e k ey to t he left energizes
o
nly t he instruments and auxiliar y equipment such
as radio and h ea ter. Turn i ng the key to the right
energizes the ig nition system and auxiliary equip-
ment. Turnin g t he key " hard rig ht " en ga ges the
starte r swi tc h. To remove the lock cyl inder fr om the
switch, fi rst tu rn t he key to the left (ignition -
auxiliary} po sition. Th en insert a short piece of
wire or a paper clip into the lock releas e hole in
the switch bod y. P ressing in on the wire will co m-
press the lock cyli nder retainer, allowing the cy lin-
de r to be removed. Ei ther pa r t, t he lock cyl in der
or the switch unit , may be replaced as needed.
T wo switches t hat a re interc h angeable h ave been
used in production. Early switches we re held in
place by a bezel and tension sp ring. L ater sw i tches
are held in place by a thre a ded bez el nut. L ock
cyl inders a re not int erchan geable between these
two switches. Early lock cylind ers were 1 ~" [31
mm.]long. Lat er lock cy lind ers a re II ~ " [39 mm.]
long. Be sure to get t he correct repla ce ment when
c hanging lock c ylinders.
1-64. Fu el Ga uge
• C] -2 A, C] - 3A, early CJ-3B.
The fuel gauge cir cuit is compo s ed of the indic at in g
unit, mounted on the instrument p ane l, a nd the
fuel tank unit, connect ed by a single wire through
the ignition switch.
Should the gauge f ail to register, c heck all wire co n-
nections to be sure they are tight and cl ea n; al so
be sur e both units a re well gro unded. If, a fte r this
check, the gauge does n ot indicat e properly, remove
the wire from the tank unit and connect it to a
new tank unit which must be grounded to the tank
or frame for t es t. Turn the ignition switch "ON"
and move the float a rm t hr o ugh its r ange of travel,
watching the das h un it to de te r mine if it indicates
correctly. If it fails to do so the trouble is probably
in the dash unit and it should be rep l aced.
Should a new tank unit be unavailabl e for this te s t,
di sconnect tank u nit wire at the ins trument panel
gauge. Connect one lead of a 6 V, 1 CP test light
to th e instrument panel un it te rmi nal and wi th t he
ignition switch "O N" ground the ot h er lead. If the
unit is op e rat i ng correctly the pointer will move
app roximately three- qua rter across th e di al.
Do not at tem pt to repair eit her unit; r eplacement
is t he only precedure.
1-65. I ndi cat or s a nd Gaug es
• Late Cj - 3B, C j- 5, CJ-6, D j-3 A
Two ga uges (fuel and te mperature } and two in-
d ic ~t..., rs (oil p res sure a nd battery c harge) that are
loca te::d in the inst ru ment cl uster a re electrically
o perated.
The fuel gaug e is connected by a single wire to a
float - and -slide- rhe o sta t sending unit in th e fuel
t
ank.
The tempe r ature ga uge is co nnec ted by a single
w ir e to a re sistance-type s en ding unit m ounted
on the eng in e.
Th e ba t tery c harge indicato r ope r ates when t here
is a diff erence in potentia l between the gene rator
and the battery. The battery ch arg e i ndi cator l ights
wh en the generator is not c harging the b at tery. Th e
ind i cato r light goes out when the generator begins
to c ha rge th e batt e ry.
The oil pressure indi cato r is connected by a single
wir e to a di ap hr agm switch loca ted on t he eng ine.
Wh en engine o il pressu re is low or zero an d th e
ignit ion switch is on, the oil pr ess ur e indicat or will
lig ht. Wh en eng ine sp eed is increased slightly above
idle speed , ra ising the oil pressure to a ppr ox im a tely
6 psi. [0 ,2 kg - cm
2
], t he diaphragm switch will
o
pen the c ircuit and the in dicato r li ght will go out.
A voltage re gulator m ai ntains a c onstant volta ge to
t he ga uges in normal operation. On early vehicles,
t his
voltage regulator wa s mounted on the r ea r of
the i ns t rum e nt cluster. On curren t vehicles, the
vol tag e re gulator is int egral with the fuel gauge.
Should trouble develop in the gauges, first check the
regulator (fuel ga u ge on c urrent pro du c tion
vehic le}. If t he voltage to the regulator is beiow
10 vo l ts in a 12 - volt syste m or 5 volts in a 6-volt
system l ow ga uge readings will result. Voltage in
excess
of 16 volts in a 12- vo lt system or 8 vo l ts in
a 6- vo lt system will not affect ga uge readin gs but
may result in pr e mature wear of the regulat or
co nt ac ts. If the volta ge to t he regulator is within
t he a bove limits, c he ck th e electrical connections
to the regulator (or fuel gauge}, e spe cia lly th e
ground connect ion. If the readings of a ll the ga uges
is too hig h, or th ey all re ad t oo low, repl ace the
regulator (or fuel gauge}.
If the te mp er at ure ga uge or h ea t indica to r in th e
instrument cl uster h ave failed, the caus e may
originate fr om the jumper bar shorting out against
t he i nstrum ent case. Ch e ck the jumper bar between
the temperature ga uge and he at indicat or at t he
rear of t he instrument case .. On l ate r produ ctio n
vehicles, the jumper bar is covered with an in -
sulating sleeve to pr otect it from shor t in g o ut
ag ainst the instrument case. If the ju mp er ba r
does not have this sleeve, either inst all one or
wrap the bar with pl a sti c electrical ta pe to half
an inch [1 em.] from each end. When i nsta lling
the jumper bar, be sure the c urv ed s eg- m ent is
closest to the fuel gauge .
Should only o ne of the two gauges regis te r incor-
rectly, check the lead wir e from the gau ?; e to the
sending unit for shorts or open connect ions. Next
disconnect th e gauge from t he sending u nit , an d
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