Tulsa daily world. [volume] (Tulsa, Indian Territory [Okla.]) 1905-1919, 1918-01-20
LESSON No. ~.
Wiring Diagram.

Nh'hE b1f'""s
Every owner OF car, which has a
starting and lighting system should
have wiring diagram Of the electric
system, and should not only have
studied II. 30 as 10 he able 10 read II
n, case OF need. but should Keep II In
the car a wire may become de-
tnched, and often. even experienced
mechanics win be at loss To know
where Il belongs unless guided by
the wiring diagram.
As rule, tho wiring diagram is
given In tho instruction book OF the
car or In special instruction book
furnished by tho makers OF the elec-
trical equipment II you have not
such diagram, II would DE well TO,
write 10 the makers, preferably or
the electrical system for one.
In all wiring diagrams Tor space
aake, certain symbols are used Ia In
dicatc the various units and devices,
and II IL necessary TO know the mean
ing Of these symhola In order tn he
able to read the diagram. The Same
symbol In used by all makers and all
diagrams 10 Indicate certain or tho
devices and mthoda OF wiring, bon
for others such ms switches, inter-
ruptor points, automatic contacts.
there IN no uniform symbol.
In the upper portion OF tho illustrh-
tlon | give list Of the symbols gem
orally used and where different SYM
bols are used Co Indicate tho same
thing. 7 give those used by four OF
the makers whose equipment Is the
most often found on the automobile.
Referring TO the illustration;
No ! denotes n positive terminal
a -. -
connecting wires 10 the battery.
generator or motor, great care must
be taken 90 connect the positive OF
the battery 10 the positive OF the
motor or generator, as shown by
the diagram. After replacing n bat
terry after charging, the negative or
osithe terminal " often grounded
whore, tho other should have been
You should observe now tho battery
n connected when /aklng II out. or
refer 10 your dlasfam whom replac-
ing.
No. represents battery. olthr
of dry cells or storage.
No. 4 represents battery Of dry
cells
No, represents a storage battery
No. G represents a groduded wire,
thnt iH, n wire attached TO some metal
part OF the car.
No. indicates condenser
No, $ shows different symbols for
q generator,
No. shows dlfforcht symbols for
the starting motor
No. 10 shows different symbols for
q switch
No. II represents fuses
No t2 shows different symbols used
90 Indicate contact points such as
interruptor points, automatic outoul
points. vibrator points etc.
No. 10 shows the symbols for
coil wrapped about an iron core MS
those used, on cut-outs regulators
ipotor or generator fields when Of
heavy blnck lines Il denotes that n
high amperaEe or voltage current.
as in the starting motor field passes
through them, while II OF light lines,
the amperaRe Is low.
No, ~ represents the ignition In
ductIon coil The heavy lines usually
Indicate tho primary coil and the
lighter the secondary.
No ib represents resistance coil
No. l6 represents crossing wires,
which nre not connected and are
insulated from one another.
No. 7 represents connected wires |
No. is represents damps Gener- |
ally the headlights are Indicated by !
an II In the circle side or DINNER by |
an S or u respectively. aud tail by a |
II In the circle
In addition 90 the above, the horn, !
interruptor distributor, and other |
devices and some Of the above are
shown In different ways hut their |
name is usually printed under them. |
Having seen tho meaning OF the !
symbols used, let us trace the yarl-
GUS circuits In n diagram as the one
shown, which Is that Of the ,Delco. |
which is used on the Buick models |
ID a.. As. 40 and Al.
First. we must determine how
many circuits there are In the sys-
TEN. Thus. there usually are the
motor circuit the generator circuit (
the ignition circuits tprlmary Hnd !
secondary Iand the lighting circuits 1
II there " trouble In one OF these .
circuits II Ia only necessary 10 trace .
that particular circuit However, a (
short circuit IN another circuit. be-
tween tho battery and the units, viii
affect other circuits. hat IN this case
the trouble viii show IN more than /
one circuit
The diagram shows the condition
when the car " at rest engine
stopped and lights out. In starring
the engine the first thing we wonld
DO would be To pun out tho ignition
switch button -. The current .gottid
then flow from the battery 20 tho
point Il. The motor brush B being