Question about Briggs & Stratton 8,000 Watt 16 Hp Portable Generator #1934

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I have a potable generator that will not turn's a 16.5 briggs vanguard v-twin motor.i replaced the coils and the diode wiring assembly.i fill the diode assembly might be that possible?

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Are you saying the engine will not turn off? The engine shut down uses a ground on the ignition circuit to shut down. This kills the circuit that provides the spark for the engine to run. See if you can trace the circuit for the shut down and check the ground connection.

Posted on Jul 02, 2009

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Why does my Vanguard 8000 generator pop the 40 amp breaker on the generator when I plug in the 30 amp cord into the generator .

There's either a short in the cord somewhere, or the breaker on the generator is faulty and needs replacing.

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Generator Not Producing Power - Field Winding

There are 4 requirements that have to be met before a generator is able to produce power. Due to number of questions that have been asked, a Coleman PowerMate 1500-1850 with a Briggs and Stratton Engine will be used here.

1) The Engine has to be turning at correct speed
2) Field Winding (Rotor) on the alternator must be energized
3) AC Winding (Stator) must create a voltage in presence of magnetic field
4) Output passes through Safety Devices before it reaches an outlet.

This Tip will cover the Field Winding.

The alternator of the generator is similar to the alternator in your vehicle. A current flows through the field winding, and creates a magnetic field. This magnetic field is rotated (by the engine), and the magnetic lines of force cut through the many coils of wire that are located in the stator.

First things first though. Lets see if the field winding (aka rotor) is any good. You will first have to disassemble the generator / alternator to get to the brushes. The brushes are how the current flows from the regulator, and into the rotor while it is spinning. Look closely, and you will see 2 rings on the rotor. Each ring is the end of the coil of wire that makes up the rotor. Using a multimeter, check for resistance between the rings, but make sure that you don't scratch or gouge them. You should have some kind of continuity here, compare your readings against what is published in the service manual. Also check each ring to the core or rod of the rotor as well. There should NOT be any continuity at all. If there is, this indicates a grounded rotor, and will have to be rewound (starter / alternator shop) or replaced.

Look at the brushes and brush holder assembly. Take a measurement of the length of each brush, and compare it to the minimum length in the service manual. If the brush is too short, or shows signs of overheating, shock, or otherwise, replace the brushes. If the brush holder is also darkened or burnt, it will also need to be replaces as well.

From the brush holder, follow the wires to the voltage regulator. In most low end generators, this is merely a capacitor that samples output voltage, and feeds it back into the rotor. There should also be a diode here as well. Again, using your multimeter, check the diode to see if it is open or shorted. If your meter has a diode check function, use it. Otherwise, check the diode using the resistance scale. You should have a resistance in direction, and infinite (open) in the other. If you have resistance in both directions, or infinite in both directions, then the diode is bad and will need to be replaced. Some meters will have a capacitor check, but the capacitor in the generator will likely be too large for this to work. Look for signs that the capacitor may be bad. Bulging, leaking, damaged terminals all indicate replacement is needed.

On generators that have an actual voltage regulator, you will need to consult the service manual for steps to check the regulator. Usually, regulators are not easily tested, and are replaced when other potential problems have been ruled out.

If a generator has sat for a long time, it may have lost its residual magnetism. When the engine is not turning, there remains a small magnetic field due to the properties of the iron / steel rotor core. It is possible that this field has dissipated over time. You can temporarily reestablish this field through a process called "Flashing." Basically, it involves connecting a lantern-type of battery between one of the brushes, and the core of the rotor. Consult your owners manual for the exact and recommended procedure.

If the field winding is testing good, its time to move onto the next tip:
Stator Winding.

on Jul 15, 2010 | Power Generators

1 Answer

I have a 18 hp b&s vanguard engine and it will only run on half choke any ideas

it,s not getting enough gas, your carburater needs cleaned and there's an mixture screw on most engine's hope this helps

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1 Answer

How to fix an off and on switch on a briggs and straton model series, 19e400 5000 watt, on and off switch located on top of the motor. is there a wire thats supposed to hook onto the switch somehow.

Kill switch should have a wire connected to the tab on the spark coil under fan cover. The switch is a means of shorting kill wire to ground. On some generators, there will be another method of shutting down the engine. Usually on/off switch will be more visable on the control panel. Most likely the switch on fan cover was not connected to prevent confusion.

Sep 14, 2011 | Briggs & Stratton Briggs and Stratton...

1 Answer

I have a 1 year old kohler command pro ch740s. i pulled plug wire off one side and cant get any spark. i pulled other side off and motor dies. can you tell me what would cause one side not to get any spark

hi there, pauly46 here

from your model type ch730 25 hp 0040 it seems that
this model does not need or use a smart spark ignition module

please check that you dont have a kill wire from your coil groundin somewhere between kill tab on your coil and the ignition switch

then if you still have no spark replace the ignition module
that has no spark - your engine has been running one 1 cyl
as soon you pulled the h t lead off the firing cyl the engine died
that tells you no fire on other side

i am sure these units do not use any diodes fitted between l/h and r/h kill wire tabs leading back to ignition switch , i think these are mainly on briggs vee twin

here is web site for service manual

enter as guest on the site
go to command pro twin
go to service manual section
select SM-24-690-07 ( replaces tp-2450c) from the list
download a copy and print

cheers hope it helps


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Troy bilt 5550 generator no start please help

fuel, fire, mechanical. Miss one and she won;t run. Are you sure the gas was good? Not some old can laying around that may have turned or become water contaminated? If it was fresh gas, then take off the air cleaner and spray a little wd-40, or ether, or brake cleaner whatever is flammable into the carb throat. Just a 1 second shot is all it should need. Try and start with that. If it starts and then dies quickly, still a fuel problem. maybe a gasket is damaged, or the jet is clogged. When you said you checked for fire, you acutally took the plug out and had it grounded while spinning the motor and saw spark? If you saw a hot spark then you have eliminated fire. Mechanical not likely if it was running well a short time before. If a valve was damaged, it would still run but not too well. My gut feeling is it is related to fuel.

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No power output

Hi, check your exciter cap inside the control box as it probably is knackered, Replace it with a new one.
Or if the unit was severly overloaded the windings are probably fried.

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