C
L
O
S
E
O
P
E
N
COVER
REAR JUNCTION
BOX
WIRE 1012B
1435
1435
1008B
1012B
1680C
1678C
1003C
1004C
Figure 1.
Rear Junction Box and Wire 1012B.
2.
Connect button probe cable to MSD/ICE test equipment (WP
0004).
3.
Connect button probe cable red lead to rear junction box, terminal wire 1012B.
4.
Connect button probe cable black lead to a known good ground.
5.
Have assistant turn engine start switch to ON. Refer to vehicle Operator's manual (WP
0190).
6.
Have assistant turn ON lights. Refer to vehicle Operator's manual (WP
0190).
7.
Perform ICE Test 89.
8.
Meter should display a reading between 10 and 14 vdc.
CONDITION/INDICATION
Are 10 to 14 vdc measured on wire 1012B at rear junction box?
DECISION
Voltage OK - Go to (Step 3 - Do rear side marker lights, and rear marker lights operate?) to verify problem is solved.
Voltage Faulty - Go to (Step 2 - Can trailer main harness wire 1012B be repaired?).
STEP 2
Can trailer main harness wire 1012B be repaired?
WARNING
Remove all jewelry such as rings, ID tags, bracelets, etc. prior to working on or around vehicle.
Jewelry and tools can catch on equipment, contact positive electrical circuits, and cause a
direct short, severe burns, or electrical shock. Failure to comply may result in injury or death
to personnel.
TM 9-2330-342-23&P
0011
0011-2