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Curtis & ALLTrax Controllers
Curtis & ALLTrax Controllers
Ground Faults
Ground Faults
Initial Trouble Shooting
Initial Trouble Shooting
Installation - CHECK OUT
Installation - CHECK OUT
The following procedure is written to test the DC/DC Converter while installed in the vehicle.  All accessories (e.g. radio, fan, heater, wipers, etc.) should be "off".  

Voltages are taken using a digital voltmeter for greater accuracy and repeatability.  The voltages may vary.

Step 1. With the ignition "off", take the following voltages to establish a baseline:

 The voltage difference at "Input" side of DC/DC Converter. ____________  Volts

 The voltage difference at "Output" side  of DC/DC Converter. ____________  Volts


 Test the fuse for continuity to verify that it is "not blown".  If there is no continuity, replace fuse.


Step 2. With the ignition "on", take the following voltages using digital voltmeter to establish a baseline:

 The voltage difference at "Input" side of DC/DC Converter. ____________  Volts

 The voltage difference at "Output" side of DC/DC  Converter. ____________  Volts


Step 3. Diagnosis

 3.1  The input side should increase from 0 Volts to Battery Pack Voltage when the DC/DC Converter is switched "on".

         If the voltage did not increase from  0 Volts, then the input wiring is the problem.  The DC/DC Converter is not being switched "on" by the primary contactor.  
         Verify that the primary contactor is being switched "on".  Check the wiring against the schematic.

         If the voltage was at Battery Pack Voltage in both cases, then the input wiring is the problem in that it is not being switched "off".  
         During charging the DC/DC Converter will see excessively high voltages.  Check the wiring against the schematic.

 3.2  The output side should increase from 12 Volts to 13.5-14 Volts when the DC/DC Converter is switched "on".  

         If there is no increase, verify that wiring to the auxiliary battery is correct.

        If the wiring appears to be correct, but there is no increase; disconnect the negative lead from the DC/DC Converter at the battery.  Tape the end of the lead and do not let it rest against the frame while testing.  Repeat Step 2.0.  This time the voltage should increase from 0 Volts to 14 Volts.  

  If there is no increase, contact EVA.
DC/DC Converter