Service Manual

TIME
SAVERS
2-10
Demystifi cation
G
lossary
Troubleshooting
Sample Problem: This GT tractor won’t turn over. The customer parked
it in the garage and turned it off. When he tried to start it a week later, he
heard one click. After that, nothing would happen when he turned the key.
We know it’s a short because we found the 20 amp fuse blown.
BU
PUR
PUR
R
R
R
R
R
R
R
Y
Y
Y Y/W
GN
GN
GN
GN
GN
GN
GN
GN
GN
GN
OR
OR
R/W
R/W
R/W
HEADLIGHT HARNESS
2
IGNITION SWITCH
OFF G M A1
RUN 1 B A1 AND L A2
RUN 2 B A1
START B S A1
GL M S B A1 A2
BRAKE +
BRAKE
PTO
PTO +
N/C
GND
+ 12V
SYSTEMS INDICATOR MONITOR / HOUR METER
PTO
CLUTCH
5
1
3
4
Relay
BRAKE SWITCH
BRAKE SWITCH IS SHOWN
WITH BRAKE APPLIED
OR/BK
OR/BK
OR/BK
OR
W/BK
W/BK
W
W
OR/BK
OR/W
OR/W
BU/W
BU/W
Y/BK
Y/BK
Step 1. Interview the customer.
Any information we get will help
isolate the problem.
Highlight the suspect area on a
copy of the wiring diagram.
Eliminate the green wires as
possibilities because they’re
supposed to go to ground.