Ignition Coil Connector; Pickup Coil And Trigger Wheel; Removing Coil Connector; Tachometer Connection - Jeep J-10 Series 1982 Technical & Service Manual

1G-12 IGNITION SYSTEMS
Fig. IG-12 Distributor Vacuum Ignition Advance Mechanism
Ignition Coil
The ignition coil is oil-filled and hermetically sealed
(standard construction). The coil has two windings
wound on a soft iron core. The primary winding consists
of comparatively few turns of heavy gauge wire. The
secondary winding consists of many turns of fine gauge
wire.
The function of the ignition coil in the SSI system is to
transform battery voltage applied to the primary wind
ing to high voltage for the secondary circuit.
The ignition coil does not require special service other
than maintaining the terminals and connectors clean
and tight.
When an ignition coil is suspected of being defective,
test it on the vehicle. A coil may break down after the
engine has heated it to a high temperature. It is impor
tant that the coil be at operating temperature when
tested. Perform the test according to the test equipment
manufacturer's instructions.
Ignition Coil Connector
The coil terminals and coil connector are of unique
design (fig. 1G-10). The connector is removed from the
coil by grasping both sides and pulling connector away
from coil (fig. 1G-13).
When a tachometer is required for engine testing or
tune-up, connect it using an alligator jaw-type connector
as illustrated in figure 1G-14.
Resistance Wire
A wire having 1.35 ± 0.05 ohms resistance is provided
in the ignition wiring to supply less than full battery
voltage to the ignition coil after the starter motor sole
noid is deenergized. During engine starting, the resist
ance wire is bypassed and full battery voltage is applied
to the coil. The bypass is accomplished at the I-terminal
on the starter motor solenoid. The bypass switch is
energized only while the starter motor circuit is in
operation.
Fig. 1G-13 Removing Coil Connector
Distributor
The distributor consists of three groups of com
ponents: pickup coil and trigger wheel, ignition advance
mechanism, and cap and rotor.
Pickup Coil and Trigger Wheel
Current flowing through the ignition coil primary
winding creates an electromagnetic field around the
Fig. 1G-14 Tachometer Connection