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SELECT DIAGNOSTIC GUIDE
REFERENCE #10
Input voltage has not reached 13.8 volt turn-on threshold. Follow
the steps below to diagnose.
Step 1: With the reefer unit off and the stinger unplugged, plug
in the 7-way cord. Start the tractor and let the engine run. Use
a voltmeter to measure the voltage between the AUX ground
stud and the AUX positive stud inside the Select Controller (see
V1 in Figure 18). It should read 13.8 volts or greater. If yes,
and the light still is not solid green, call customer service, as
the Select Controller or Control Module may be defective. If no,
proceed to step 2.
Step 2: With the reefer unit off and the stinger cord unplugged,
plug in the 7-way cord. Start the tractor and let the engine run.
Use a voltmeter to measure the voltage between the AUX
center pin and the top ground pin on the 7-way receptacle on
the trailer (see V2 in Figure 18). It should read 13.8 volts or
greater. If yes, repair or replace the wiring between the 7-way
receptacle on the trailer and the Select Controller (check the
wiring, connections, and fuses, if existing, in the 7-way nose
box). If no, measure the voltage at the truck battery. If the
reading is greater than 13.8 volts, the issue is in the wiring from
the 7-way to the truck. If the reading is less than 13.8 volts, the
issue is the charging system of the truck; allow the battery to
charge or repair the charging system on the truck.
REFERENCE #11
Excessive Voltage Drop:
Step 1: Check wires and connections from 7-way nose box
to Select Controller, making sure wires are undamaged and
connections are clean and tight.
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