5 OHMS
5 OHMS
_
_
OHMMETER
.5 OHMS
COIL
.5 OHMS
OHMMETER
DISTRIBUTOR
_
IGNITION
+
DUAL LEAD
+
SWITCH
CONNECTOR
IGNITION
+
SWITCH
_
COIL
+
DISTRIBUTOR
2
AMP
DUAL LEAD
1
METER
CONNECTOR
2
DISTRIBUTOR
AMP
1
3
4
METER
5
3
4
5
ASf06062
_
+
DISTRIBUTOR
ASf06060
_
+
BATTERY
Figure 6-62.--Pickup coil ground test.
BATTERY
Turn the ignition off and check the distributor
pickup coil by connecting an ohmmeter between wiring
Figure 6-60.--Harness connector Nos. 4 and 5 tests.
harness connectors Nos. 4 and 5 (fig. 6-60). The
of the tests, check the bold-printed circuit cor-
resistance should be between 150 and 900 ohms. If the
responding to the tested connector.
reading fails, disconnect the distributor dual lead
connector. Attach the ohmmeter to the connector
The Chrysler electronic ignition system used in tow
coming from the distributor and check for resistance
tractors can be either a single ballast resistor/four-pin
(fig. 6-61). If the reading is still not between 150 and
control unit or a dual ballast resistor/five-pin control
900 ohms, replace the pickup coil assembly in the
unit. The dual ballast resistor/five-pin system is used
distributor. Connect an ohmmeter lead to a good
here for troubleshooting even though the procedures
ground, and then take the other lead and connect it to
(except the connector No. 3 test) are the same. The
either of the connectors on the distributor (fig. 6-62).
ballast resistor reading for the single resistor will be 1.2
The ohmmeter should show an open circuit. If the
ohms (instead of the 5 ohms and .5 ohm on the dual
ohmmeter indicates a reading, replace the pickup coil in
resistor).
the distributor.
To check the electronic control unit ground circuit,
connect one ohmmeter lead to a good ground and the
5 OHMS
other lead to the control unit's pin 5 (fig. 6-63). The
_
OHMMETER
.5 OHMS
21
3
COIL
DISTRIBUTOR
_
IGNITION
+
DUAL LEAD
+
SWITCH
CONNECTOR
5
4
2
AMP
1
METER
DISTRIBUTOR
3
4
5
ASf06061
_
+
OHMMETER
BATTERY
ASf06063
Figure 6-63.--Control unit No. 5 test.
Figure 6-61.--Distributor dual lead test.
6-51
