505 L4-1971cc XN (1983)
Ignition Control Module: Testing and Inspection
Fig. 14 Electrical Circuit Check Points
Electrical circuit check points
1.
Connect the test lamp between the coil positive terminal and ground. If test lamp does not light up, check feed to coil.
2.
Connect the test lamp between the coil negative terminal and ground. If the test lamp does not light up, There are two possible failures:
a. The coil primary circuit is open.
b. The amplifier module power transistor has a dead short.
Fig. 3 Ignition coil test.