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My generator runs fine but won't put out any voltage. It was running fine and producing voltage under nominal load and then it just quit generating (enigne was still running but no power. Produces 8 volts on 240 VAC coil; 4 volts on 120 VAC coil. Changed the regulator but that did not help. Where else should I look?

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Inside the gen head in the back their will be a 1x1x3/8" black
with 4 wire conn thing it is a rectifier theirs a hole in the center for mounting as well replace that and should be ok a big surge and age will take them out try this i willing to bet that's it unless it is smoked the part is common and avail by ebay as well as radio shack numbers will cross ref on the item good luck hope this helps

Posted on Aug 30, 2010

  • joseph tufaro
    joseph tufaro Sep 02, 2014

    my 30kw kohler gen doesnt put any voltage out

  • Robert
    Robert Sep 02, 2014

    some Kohler gen sets have brushes and some don't can you supply more info on your unit

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First verify that the breaker for the outlets is not tripped and make sure that the generator is running at full operating speed. let it run for 5-10 minutes and check for output power. If there is nothing, there are two possible problems. One could be that the automatic voltage regulator is bad. The other is that the field needs to be flashed - a high possibility if the generator has not been run in a long time. There are many videos on the internet that show you how to solve both of these problems. Just do a search for No output from a portable power generator.

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On the engines carb. is a governor rod should connect to the front case of the engine. This rod should have an adjustment to slow the engine speed. BUT,,, are you reading the generator unloaded or without any thing plunged into it? Once you have the generator loaded with a device, the voltage should drop to a constant 240vac. 150 rpms should not make that big a difference on the voltage output, and if running under load the RPM's should drop also..

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The voltage regulator for the generator is not work, replace it. Why, if there no dc voltage to excite the stator it won't any output. GB...stewbison

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We have a Valsi 5500 watt generator that isn't putting enough voltage out to run everything in out small travel trailer. It runs the lights but doesnt push out enough voltage to carry the A/C, microwave,...


How long have you had this generator?
Has the generator worked on all of these loads before?
Model 5500 is a 5500 Watt generator which could easily be 5500 watts (Peak) and not continuous.

Your AC is an inductive load.
Your lights are resistive loads

An inductive load can cause issues when starting due to an increased current demand at start up that some generators cringe under. Do the lights flicker or are they stable? I'd say your diodes on your stator are working if you have light stability but you haven't provided nearly enough information for a detailed solution.

I'm sure you have enough voltage but you aren't getting enough current to run specific loads. How many watts is your AC? How many watts for your microwave? Both of these units demand a great deal of energy to run and when you place too much demand on your generator, it will choke it out and eventually, will cause damage to the generator. You may consider getting a beefier generator with a greater amount of wattage output.


Seeing these specs online and noting what you are trying to run, you have an undersized generator and need to get one that can produce a greater amount of running wattage (as well as peak wattage).

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I have a coleman 5000w generator. when its running it's rpms are way high and my volt output on the 120 side is 153v how can i slow yhe rpms down is this a carb broblem thanks mark


Hi
Some small generators that do not have a built in AVR are set up to give the nominal voltage at it's nominal loading. this meens if it is unloaded the rpm 's creep up and so does the voltage.
I would suggest running the generator with the load you normally connect to it and ****** the fueling till you get the nominal voltage you require. (record any change you make)
If you are connecting this generator up to a house be very careful not to leave any sensitive equipment connected in the house as the voltage will be jumping eraticaly as it is loaded and unloaded, one item that gets hammered is the electronic contol on boilers/burners.
Regards

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Hi and welcome to FixYa. I am Kelly. Since you did not mention the make or model number of your generator I will respond in generic terms. If your generator is at 127 volts with NO load it is adjust at the very top end of the manufacturers limits. There is a 10% tolerance so 120 VAC + 12 is 127 VAC. Under an electrical load above 500 watts the generator should drop the output voltage slightly so your generator would still be within factory limits. Personally on any generator as a repair person; I set the output voltage at 126 VAC no load so that when the user puts the generator to work the output voltage is good. If your generator is running at 127 VAC under load then you can adjust the governor screw on the governor plate CCW about 1/2 turn to drop the voltage. Without a generator model number or engine number I can not tell you exactly where the governor plate is on your engine / generator. The screw will have a lock nut that you must loosen 1/4 turn then turn the adjustment screw CCW to drop the voltage. Just make sure to re-tighten the lock nut when the adjustments are complete. Mind you by decreasing the output voltage you also drop the output freqency at the same time you decrease the output voltage. It is better to have 125 -127 VAC under a no load condition as the more electrical load you add the more voltage drop you will notice. It is best to adjust the generator to 122.5 -123 VAC under a medium load. (50% of output capacity) A bread toaster is 1400 - 1600 watts and is a good load for a 3000 watt generator. Also a good hand held hair dryer will use around 1600 watts. If you use this type of load and the voltage output is 122.5 to 123 VAC I would not adjust anything. I have been working on generators since 1970 so this is nothing new for me. I hope that you understand everything I posted. If not, feel free to ask as many questions as you wish in any future response.
Thanks for choosing FixYa,
Kelly

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Those voltage readings MAY be normal.

The AC waveform may cause your meter to read inaccurately. You would need to use a TRUE RMS meter to accurately read the voltage.

The siple meters actually read the AVERAGE voltage and then are calibrated to mulltiply it by the "form factor" for a sine wave. OFTEN these generators don't produce a clean sine wave. A square-ish wave will read higher on the garden variety meters.

Compare the brightness of a lamp comparing to when run on your utility.

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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

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