testing voltage regulator - HCS Snowmobile Forums

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Old 01-24-2006, 09:07 PM   #1 (permalink)
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need help . how do you test the voltage regulator ? or can you test a voltage regulator ? its a 99 xc 500
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Old 01-25-2006, 12:20 AM   #2 (permalink)
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Measure ac volts across brown and yellow wires. As you rev it up the reg should clamp it at 14-16 volts or so. If it's blown, you will burn light bulbs out. It just dissapates the "extra" voltage ,clips the tops of wave form. With lights unplugged to spare them, you could unplug reg and see voltage rise freely when revved.
What is the problem??? Mark
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Old 01-25-2006, 09:38 AM   #3 (permalink)
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machine has electric start and it reads 11.5 across battery when running. wires got extremly hot coming out of rectifier.
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Old 01-25-2006, 04:49 PM   #4 (permalink)
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Current Sled(s): 05 600 xcsp 50th
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Quote:
Originally posted by pugz414@Jan 25 2006, 09:38 AM
machine has electric start and it reads 11.5 across battery when running. wires got extremly hot coming out of rectifier.
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Don't those regulators bleed off to ground?? ...can't remember for sure but thought those sleds regulator had only a single wire input...could be a faultly regulator.. but better check for anything that could be loading the system down.. pinched wire...handwarmers... thumbwarmer..any accessory added on...etc...meaning there could be a short somewhere....probably start by disconnecting the electric start and running the sled manually to see if its better. You should be able to run the the sled no higher than ata low idle speed without the regulator to see if the voltage is around 14 vac. Don't rev it higher or bulbs and tach will fry.
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Old 01-25-2006, 05:01 PM   #5 (permalink)
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What does the batt read when sled is off? 11.5 is near dead. I could be that it's a bad battery (cell ,etc) , it would make charging wires hot, trying to get it up to 13.5 to 14.5 or so running. Does it start OK? Did not know it was electric start. For sure measure with DC setting. The "regulator" is still simple type (Zener diodes to ground) but regular diodes used to make DC (for batt charging). Not like a car system.
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Old 01-25-2006, 07:46 PM   #6 (permalink)
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thanks for all the help . the voltage regulator is bad it read over 18v at idle and went to 30v plus at higher rpm. and the battery was dead I didnt realize it I had peen pull starting the machine since I was testing wires over there. thanks again for all the help .
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Old 01-25-2006, 09:02 PM   #7 (permalink)
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Bad ( essentially no) regulator will kill battery by overcharging. Maybe it happen that way. Or , batts in sleds don't last long, off season storage and rough handling ( = normal riding) are hard on them.
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