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I have a yamaha YG600D generator and replaced the voltage regulator because when the unit slows down the voltage was irregular.this did not correct the problem. The voltage drops to approx 85 volts now.Is the problem the DC rectifier or the slow down circuit board .How can I check.

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You have a weak rectifier if it will not produce the needed voltage. Rectifiers are checked with an ohm meter

Posted on May 20, 2011

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Posted on Jan 02, 2017

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2 Answers

1991 yamaha g5a gas golf cart new battery/voltage regulator wont charge battery


Regulator is either faulty or not wired correctly.
The maximum voltage on the 12volt battery must be no more than 14volts on charge.

Jun 01, 2018 | Yamaha Motorcycles

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Where can i get spare parts for a hyundai hy3000si generator [ie] voltage regulator


voltage output readings are governed by rpms of the motor
check that the engine rpms are correct by adjusting the governor setting
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Jul 23, 2016 | Electrical Supplies

1 Answer

Only getting 80 volts


First check you engine's rpm. Your generator is a 60 hz unit it need to be 3600-3750rpm; if 50 hz then it need to be 3000-3100.

If voltage is still down and the rpms are correct then alternator's voltage regulation circuit needs checking. To do this you need to have make and model posted.

Dec 17, 2014 | Honda Eb 3500 Generator

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Have continually to increase speed to maintain voltage


Check the idle-stop screw. They tend to back out, causing the generator to slow down and not maintain regulation

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Will the voltage regulator on a 92 yamaha xj600 work on a 2002 yamaha v-star 1100???


I can remember if these are AC / DC generators how many wire do the xj and vstar regulators have? in general most regulator can be swaped as long as they run the same current.

Feb 23, 2012 | 1991 Yamaha XJ 600

1 Answer

Generator has voltage drop, why?


Most of the small portable generators will depend on the engine speed to regulate the voltage. If the motor is at the correct speed you are getting 120 volts 60 hertz, if not it will read lower like 115 volts 55 hertz or so. This can be fixed by adjusting the governor, or idle speed needle.

Feb 16, 2011 | Yamaha 2300 Watt Generator - EF2600

1 Answer

The wires going to the voltage regulator keep burning up.


Common problem with poor quality parts, the regulator is the problem, the generator is working other wise you would not have fried the wiring, you answered your own question. someone telling porkies to get more money from unsuspecting client?
The regulator controls the voltage not the generator, the generator only supplys the voltage it cannot overcharge unless the regulator is not working properly, simple!

Jul 27, 2009 | 2002 Yamaha V Star 1100 Custom

1 Answer

No charge


You'll need to test to see if you are getting voltage from the brushes. This is a live test so, using something like alligator clips or such on the metal bracket of the brushes for your volt meter is a good idea. Simply start your generator with the volt meter leads attached to the the brush holders or exposed electrical connection to the brushes and see if they are producing electricity (120vac or greater). No voltage then it's your brushes, field, or stator. If they are good check the output of the voltage regulator. If it to does not kick down any voltage above 120 then it's your problem.

Note most cheap generators do not have a voltage regulator. All generators depend on the correct engine rpm to achieve normal voltage. 3600 rpm is the correct speed on a two pole generator to produce 110 to 125vac and 60hz (normally found on gas generators). 1800 rpm is the correct speed for four pole generators (normally found on diesel generators). You may set your rpms slightly higher to ensure that it's maintained underload ie 3750 for gas. Diesels usually have very good governors and don't need to be set higher.

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Low voltage


Most generators use a flyball type governor within the engine to control rpm; also there is a voltage regulator that tries to maintain voltage at about 115v. The voltage regulator varies the voltage to the armature increasing /adjusting magnetic force. Use a meter with htz or freq setting to adjust engine governor to 60 cycles. When the generator is producing 60 cycles, the engine should be turning 3600 rpm, max power range. At 3600 rpm the voltage should be 115 to 120 volts. Loading the generator will cause governor to try to maintain 3600 rpm. Check engine manual for proper adjustment of gonvernor and linkage. The governor mech should last the life of the engine, however governor system does wear out. Expensive repair. enjoy

Nov 26, 2008 | Yamaha Electrical Supplies

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