TROUBLESHOOTING 999 SERVICE/MAINTENANCE MANUAL
10-38
Published 05-16-17, Control # 233-03
Test 6 – Testing for Voltage at the Fuse Box
Use a digital multi-meter for testing voltage at the fuse box.
To test for volts DC at any given fuse socket, place the
positive lead on any metal fuse contact and the negative
lead on the grounded fuse box chassis. Repeat this
procedure using the other fuse contact as a test point. All
fuse sockets except F12 (3A, 10V) should be 12 volts DC.
To determine if relay K1 is fully functional, ground the fuse
box chassis and check for 12 volts DC at relay wire 8 when
the relay is enabled. Also check for 12 volts constant at relay
wire 5A.
Item
Description
1 Fuse Block
2 Metal Fuse Contact
3 Air Conditioner CB (15 amp)
4 Controller CB (50 amp)
5 Transient Suppressor Diode
6 Fuse Box Chassis
7 K1 Cab Power Relay
A1185
F6 - Boom & Jib Top (8B)
K1 - Fuse & Breaker Power (8) 70A. Relay
S1 - Computer Power (8P1) 50A. Breaker
S2 - Heater & A/C (8H) 15A.Breaker
F13 - Hydraulic Clutch Solenoid (8C)
F12 - 10VDC Regulated (87FA)
F11 - Overhead Wiper (8W2)
F10 - Front Wiper (8W1)
F9 - Front Console (8X)
F8 - Press. Transducers & Encoders (8T)
F7 - Swing Lock/Park (8S)
F5 - Defogger Fan (8F)
F4 - Computer Inputs (8D)
F3 - LMI & Gauges (8A)
F2 - Horn (5H)
F1 - Cab Power (5D)
3
2
1
F1
F1
1F
F10
9
8
7
6
5
4
3
F
F
F
FF
F
F
F
Spare
Spare
SpareSpare
Spare
Spare
Spare
F1
10A.
10A.10A.
2
10A.
10A.
10A. 10A.
15A.
10A.
10A. 10A.
3A.
10A.
10A.
10A.
15A.
3A.
10A.10A.
10A.
539003 3-28-00
AUX.
BAT.
BAT.
AUX.
30
85
86
87
S2
30
85
87
86
K1
S1
Spare
Spare
F2
F3
F4
F5
F6
F7
F8
F9
F10
F11
F12
F13
Spare
Spare
F1
Spare
Spare
Spare
J9
K1
S1
S2
AUX.
AUX.
BAT.
BAT.
E2 E1
D1
GND
12VDC
TP1 TP2
1
2
3
4
6
57
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