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DIRECT DIAGNOSTIC GUIDE
REFERENCE #4
Input voltage has not reached 13.8 volt turn-on threshold. Follow
the steps below to diagnose.
1. With the stinger cord still plugged in, and the tractor running,
use a voltmeter to measure the voltage between the dual pole
positive stud and the dual pole negative stud inside the Direct
Controller (see V1 in Figure 9 or 10). It should read 13.8 volts
or greater. If yes, and the light still is not solid green, call
customer service, as the Direct Controller may be defective. If
no, proceed to step 2.
2. With the stinger cord still plugged in, and the tractor running,
use a voltmeter to measure the voltage between the positive
and negative poles in the stinger receptacle (see V2 in Figure
9 or 10). It should read 13.8 volts or greater. If yes, repair
or replace the wiring between the stinger and the Direct
Controller. If no, measure the voltage at the truck battery. If
the reading is greater than 13.8 volts, the issue is the wire
from the stinger 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 #5
Excessive Voltage Drop:
1. Check wires and connections from stinger or 7-way nosebox
to Direct Controller, making sure wires are undamaged and
connections are clean and tight.
2. Disconnect the stinger or 7-way cord, apply a load of about
20 amps, and measure the voltage. Voltage must remain
above 10.5 volts. If not, test the stinger or 7-way cord and the
wiring in the truck (wires from truck battery to stinger or 7-way
connection on truck).
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