Service manual

IGNITION SYSTEM
SERVICE MANUAL NUMBER 26
90-861329--1 MARCH 1999 Page 4B-13
Testing Ignition Coil
1. If not already done, disconnect wiring from ignition coil. Connectors are molded and
keyed to assure proper positioning. The terminal (e) feeds 12 volts to the distributor.
NOTE: Upon reinstallation, first install black connector (distributor harness) to coil. Then
install gray connector (engine harness).
2. Set ohmmeter to “Rx100” scale and connect one lead to 12 volt terminal (b) of coil and
the other lead to “ground” (d), any clean metal on the coil frame. Reading should be infi-
nite. If not, replace coil.
3. Set ohmmeter to “Rx100” scale and connect to 12 volt terminal (b) and terminal (c).
Reading should be approximately .4 ohms. If not, replace coil.
4. Set ohmmeter to “Rx1” scale and connect to 12 volt terminal (b) and tachometer terminal
(f). Reading should be approximately .4 ohms. If not, replace coil.
5. Set ohmmeter to “Rx100” high scale. Connect ohmmeter to 12 volt terminal (b) and to
coil high tension post (a). Reading should be between 7800 and 8800 ohms. If it reads
outside of this range, replace coil.
Testing Pickup Coil
70105
b
c
d
a
a-Connector
b-GREEN Lead
c-WHITE Lead
d-Distributor Housing
1. Remove distributor cap.
2. Identify the two pickup coil leads. On almost all applications these two leads are one
WHITE and one GREEN. Remove the connector that houses these two leads from the
module.
3. Set ohmmeter to “Rx1” scale. Connect one lead of ohmmeter to WHITE lead and the
other to distributor housing. Reading should be infinite. If not, replace pickup coil.
Index