Portable Generator End Testing (AVR & Brush) 

That young man was a very good explanation of the troubleshooting of the generators that I have ever came across. Clear and concise. Thank you for sharing your knowledge of these units.

You did extremely well. This was the best video for troubleshooting generator motors.

Best step by step generator diagnosis video so far and I've watched a few.

Tyler, you are the man, I now understand how my genny works and what can potentially go wrong with it.

Some generators of the 'BRUSHLESS' have a rotor with double windings, connected together by a set of diodes or rectifiers/bridge. The rotor spins within a slight magnetic field building up alternating current which in turn is changed to D.C. and creates a powerfull field on the 2 faces or poles of the rotor. As you know, a diode prevents current flowing in one direction, yet allows in the other direction, like as my friend Taryl says, an electrical check valve. The fixed winding/s are known as the 'ST8or or Stator, the part that turns is the revolving field known as a rotor. This whole assembly is in ways similar to the alternator in a car. the rotor here being of 2 poles only while the rotor in the car has a number of toothlike poles, but then again, the car alternator is delivering 3 phase power and changing to D.C. by means of the bank of diodes. The AVR here is similar to the voltage reg. in a car, the lower the btter gets due to the load placed on it, more field is applied to the rotor thu, yup the sliprings. No matter how many KW at a given voltage, over-curent must be avoided, that is why fuses or circuit breakers are employed.

Great information shared here, thank you

Outstanding I understood ever detail on how to test my cat 8000E. Very clear and cool way to do a youtube everyone needs to watch this guy is great. Thank You

Wow! Great teaching. Thank you Kind regards, Craaig

Thanks! Good explanation!

Great video. The best on here for this type of fault. I have ordered a new AVR. Thanks.

Thank you very much I learned a lot

thank you for the information sir.

So, the AVR is actually regulating the main AC output voltage, by regulating a DC voltage that goes to the rotor coils ? You put 12vdc to the rotor coils, that resulted with 57vac main output. So, I'm assuming about 26 ish vdc to the rotor coils , would create the desired 120 vac ? I would be curious to see the actual voltage the AVR sends to the rotor coil. BTW, Great video.

well done! if you ever want hvac instructions just let me know.

Excellent video! I have surging power at my outlets on a 2200 watt generator. Produces power for a second, then no power, keeps repeating. When I run 12v to the brushes, everything works as it should... what could it be? Thanks in advance

Great info thanks for your help sir

Good video. Thanks.

Exellent tutorial. However you skipped over how to match your hertz to your voltage and engine speed. For example if your hertz are at 70 and you need them at 60 but your voltage is 120 @ 70 hertz. when you adjust your engine speed down to 60 hertz now you have 105 volts or so. I liked your video it was spot on.

thanks !

Excellent video...thanx! Is there a way to test just the AVR in order to see if it's working or not? (I am a novice at generator repair, and my 6.5KW 220v gen suddenly has no output power). Thanx & Regards, Alex Cape Town.

Hey Tyler I need a little help. (Great vid btw) my portable generator is a 12,000 watt 120/240. My question is can any generator of this type (no switch to transfer from just 120-120/240 volts it’s always 120/240) however what’s the reason they tie all the common wires on the r1 stud and can I re wire mine So all the common wires are on R1? And if I can what can I expect as far as performance I.e. wattage , volts , etc P.s. it is, an AVR style generator like yours in the video. Thanks so much for any input or help you can offer. Thanks Tyler

Briggs & Stratton generator ran out of gas under load, upon filling and restart, (which I believe was done under power) it blew several control boards on appliances, garage door openers etc…. Voltage tested properly from generator, but lights were coming on and off, as if AVR was toast??? What do you think?

nice thanks a lot

Great video, so I tested my brushes output and I'm getting 70 volts AC. Rotor is toast I guess?

Hello there what is the difference between the AVR and the capacitor so is this is considered as a capacitor Or just a voltage regulator?

What’s up man. Great video. I’m getting 90v through my brushes. What would cause that?

Great 👍

Great video. I learned a good bit. I have a generator that shakes like hell when the capacitor is hooked up but runs smooth when it’s out. It’s a brushless gen end. Anybody had a problem like this?

my same generator starting no problem but no out put power,,please solve this problem

I have 110 on only 1 plug on my 220 output?

Do you support Kubota generator?