New Holland CX720 Repair Manual page 2317

Start control Start switch - Testing (B.80.A.90.82 - G.40.A.20)
N° Test Point
1 Remove electrical connector from Ig-
nition Switch.
While holding Ignition Switch in
"START" position, check for con-
tinuity between (pin 1 and 2).
2 While holding Ignition Switch in
"START" position, check for con-
tinuity between (pin 1 and 6).
3 Ignition Switch in "IGN/ACC" posi-
tion, check for continuity between
(pin 1 and 6).
4 Ignition Switch in "IGN/ACC" posi-
tion, check for continuity between
(pin 1 and 4).
5 Ignition Switch in "ACC" position,
check for continuity between (pin 1
and 4).
6 Ignition Switch in "OFF" position,
check for continuity between (pin 1)
and (pins 2 , 4, 6).
Start control Neutral start relay - Testing (B.80.A.90.84 - G.40.A.20)
NOTE: The batteries must be fully charged and all connections clean and tight. Use a multimeter (DVOM) for these
tests. For battery testing and service, see the battery section in the service manual.
DO NOT use a self-powered test light for any of these tests. Use of a self-powered light can cause damage
to components in this system. M979
Before performing any of the electrical tests, be sure all operating controls are in neutral or park lock position.
This will eliminate accidental movement of the machine or start-up of power driven equipment. M980
N° Test Point
1 Ignition Switch in "START" position.
Measure for 12 volts at Neutral Start
Relay (pin 1).
2 Measure for 12 volts at Neutral Start
Relay (pin 3).
3 Measure for 12 volts at Ignition
Switch connector X068 (pin 2).
POWER PRODUCTION - STARTING SYSTEM
Expected Result
Continuity
If good reading, go to next test point.
Continuity
If good reading, go to next test point.
Continuity
If good reading, go to next test point.
Continuity
If good reading, go to next test point.
Continuity
If good reading, go to next test point.
No continuity
If good reading, Ignition Switch oper-
ating properly.
CAUTION
WARNING
Expected Result
12 volts.
If good reading, go to next test point.
12 volts.
If good reading, go to test point 4.
12 volts.
If good reading, repair open in 91
(OR) circuit between Neutral Start
Relay (pin 1) and Ignition Switch
connector X068 (pin 2).
2 4/7/2006
B.80.A / 9
Other Result (Possible Cause)
Ignition Switch
Ignition Switch
Ignition Switch
Ignition Switch
Ignition Switch
Ignition Switch
Other Result (Possible Cause)
Perform C - Neutral Switch Test
Open or short to ground in circuit 91
(OR) between Ignition Switch con-
nector X068 (pin 2) and Neutral Start
Relay (pin 3). A short to ground will
blow Fuse #38.
Go to next test point.
Open in unswitched B+ circuit.
Perform A - Ignition Switch Power
Supply Test.
Ignition Switch
Perform B - Ignition Switch Test