How to test a voltage regulator??? - HCS Snowmobile Forums

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Old 01-27-2011, 07:28 PM   #1 (permalink)
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Current Sled(s): 2012 Switchback Assault
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Default How to test a voltage regulator???

2009 Dragon 600 S/B. Sled won't start (blown ECU), but I want to test my regulator to make sure it is still good. Since it won't run, I have no easy way to test it (i.e. can't measure voltage at idle). I have the regulator removed from the sled and sitting in the garage. I have a voltmeter and DC power supply. Is there any way I can test the health of the regulator?

Last edited by Max_Power; 01-27-2011 at 07:35 PM.
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Old 01-27-2011, 10:35 PM   #2 (permalink)
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So I found out how to do this myself, so I thought I would post it here in case anyone else has the same problem. To test the regulator on it's own, all you need to do is apply a DC voltage to the incoming AC connections on the regulator (i.e. the 3 large yellow wires). These 3 yellow wires are what carries the 3 phase AC voltage from the stator. Using a DC power supply, I placed my leads across wires 1 and 2 and slowly increased the voltage from zero to 16 V. As I was doing this, using my multimeter, I was measuring the output voltage of the regulator (i.e. the brown(ground) and red(hot)). The output voltage should read about 0.5 to 1 V below what the input voltage is, and should NOT go above 14.8V. Once the output voltage hits 14.8V (as per the service manual), the regulator should cut out. I repeated these same steps across wires 1 & 3, and again across 2 & 3 to ensure all 3 phases worked properly. All 3 tests cut out at 14.8V, so the regulator is working fine.
Hope this helps someone in the future.
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