Question about 2000 Yamaha DT 125 R

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I have Irregular voltage to top coil Sometimes I get 15v other times 3v Have had generater checked out by west country windings No fault was found All wires look ok thanks for any help Stephen

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Looks like your wiring has got spliced somewhere. Change the entire wiring

Posted on Dec 31, 2010

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My Vizio E500i-B1 won't turn on, replaced the power board, still won't turn on. 24V pins are only putting out 15V, PS-On is outting out .3V. What can I check next? Please help! Thanks!

Disconnect all the circuit boards from the power supply board and test the voltages again. If the voltages are correct, connect the other boards one at a time to see if one is dropping the voltage on the power supply. If you find one that lowers the power supply voltages to what you read before, that may be the problem board.

Jan 02, 2016 | Vizio Televison & Video

1 Answer

Only has 120 volts,can not get 240volts

the generator consists of 2 120volt windings that run in parallel for 120 volts and in series for 240, check the change over switch make sure a wire hasn't fallen off, if you have a multi meter check both coils have the same resistance

Jul 19, 2014 | Coleman Powermate Powermate 5000W...

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Coleman powermate generator runs with no power

If we assume for the moment, that the internals of the generator are all ok. This problem is usually caused by not running the unit on load for a long time, a year for instance. During this time the residual magnetism in the field coils will slowly decay. When the unit is running the field coils control the power generated by the main windings. The higher the excitation voltage in the field coils, the higher the voltage generated by the main windings. The field coils are controlled by their magnets which, once a voltage has been generated, they will then self excite themselves.
However, if all of the magnetism has decayed then the field coils cannot generated because they have no excitation to start them off.
What you need to do is to find the field coil windings and while the unit is running with a load plugged in to it, you need to flash a voltage across the field coils.this will excite the field coils, part of that is used to do whats called self-excitation, is.
If you do this then a 12 volt car battery is a sensible thing to use for a power supply. But, as soon as the field coils start to self-excite then that voltage will increase far beyond 12 vo9lts. That is why you need a good size load connected, As the unit starts to generate then that load will alert you to remove the temporary supply, if you leave it connected the battery acid would rapidly boil and it can split the battery cases. That is why it's called 'flashing' it up. Once generating it wants leaving for a good hour,
If that does not produce results then the fault is deeper and requires testing by a qualified engineer.

Nov 11, 2013 | Coleman Electrical Supplies

1 Answer

Voltage shows 80 on 110v and 155 on 240v

if you take the end of the generator off you will see a rectifier or four diodes with a varister or a full wave brige rectifier, sounds like you have a bad diode, or a shorted exite winding to the rotor, the exite winding is a small turn winding feeds the rectifier board that ac signal is converted to dc to feed the rotor ,the rotor produces a magnetic field which rotates inside the stator windings , the magnetic lines of flux from this field cut through thre stator winding inducing a voltage in the stator coils. hope this helps

May 27, 2011 | Dewalt DG6000 Heavy Duty 6000 Watt Gas...

2 Answers

Honda generator motor runs but no electricity.

You should open the back cover of the alternator, take a voltage meter and check for voltage if there is no voltage then check the brush if the brush is ok then change the avr .

May 12, 2011 | Pramac Commercial 5000 Watt Honda ...

1 Answer

I have a HusqvarnaYTH1848XP lawn tractor with a KawasakiFH531VA41518 engine fitted. I have had coil problems in the past and have replaced both. The engine is now running roughly with loss of power and...

hi david

need more info , your description says that engine will run without ht leads being connected to plugs ?

most times if plugs are connected and key turned off , engine will run on then eventually stop and can sometimes even reverse its rotation when it does so which is known dieseling or run on

if the plug leads are off and the engine continues to run the only way it may run is if it has carbon glowing on the piston top or cylinder combustion chamber

Ignition Theory of Operation

Mounted to the periphery of a flywheel are a pair of magnetic poles (south leading in clockwise rotation), generated by

a permanent magnet. By rotating the flywheel (magnetic poles) clockwise past the ignition module on a laminated core group, a voltage is generated in the primary winding (L1).

This generates a small bias current to flow through the control resistor (R1) to the base of (Q1). This base drive causes

the transistor to conduct (turns on) completing the primary circuit. Current flows from the high side of the primary winding

through the transistor (collector to emitter) to ground.

The trigger sensor (TS1) senses the optimum time (peak current) to remove the base drive from the transistor (Q1).

This abrupt "turning off" of the transistor causes an interruption in current flow which allows its associated flux collapse,

and several hundred volts is induced through the primary winding (L1) inducing a very large voltage in the secondary

winding (L2).

When the secondary voltage reaches several thousand volts the spark plug (SP) gap is ionized and ignition

occurs. The placement of the trigger sensor internal to the ignition insures constant timing over speed and temperature

and prevents counterclockwise operation.

The diode (D1) in the ignition shut off circuit blocks inadvertent application of battery voltage, protecting the internal

components of the ignition. With the stop switch (SW) in the closed position primary voltage is routed to ground, preventing ignition operation.

has anyone had the wiring connectors apart in / and around ignition and charging systems?

this problems is very strange

please get back to me

cheers pauly46

Apr 03, 2011 | kawasaki Fh641v 21hp 21 Hp Riding Lawn...

1 Answer


The armature (rotating field) is powered by the voltage regulator for 'excitation' which is the term describing a magnetic, revolving field. This magnetic field 'induces' voltage into the stator windings (stationary outer winding), producing voltage for use at the recepticles. Some older generators used a 'permanent magnet field, instead of using a powered winding from a regulator and the voltage and frequency were set by the RPM.
Frequency is still a function of RPM, but the voltage is controlled by the voltage regulator.

Aug 28, 2009 | Electrical Supplies

1 Answer

2005 yamaha royal star venture. Still haven't found the problem with no spark on left rear coil. I replaced the coil, but there still isn't any spark. The wires (orange and black/red have continuity to the...

If you have continuity from the coil to the ignitor, the problem lies within the ignitor. The coils function by having a constant battery voltage on the red/black wire (you'll notice that ALL the coils have a red/black wire) - the primary windings in the coil charge up, until the ignitor "grounds" the colored wire (grey and white in the front, orange and yellow in the rear). As the voltage in the primary winding drops, it creates a strong magnetic field - the magnet (laminated iron) in the center of the coil charges the secondary windings, and the very high voltages generated fire the plug. You've already determined that the voltage on the orange wire is higher than the voltage on the yellow wire; that could only be because the orange wire is not being "grounded" on a recurring basis by the ignitor. (You have to remember that the meter you're testing the leads with cannot react to changes in voltage nearly as quickly as they happen; to really "see" what's happening at the coil, you'd need to use an oscilloscope).

Aug 25, 2009 | 2005 Yamaha Royal Star Venture

2 Answers

Brushless powermate (Black Max) Brand New Unit but never put out power

I looked at your parts blow up and noticed that you generator has a brush pack and a voltage regulator. Here are a couple of tips that may help you determine which part is at fault. Obtain a 12 - 16 volt ac power supply of about 1 amp and same voltage DC power supply. I find these at a thrift store and are used to power phones or door bell etc usually about 2 to 3 dollars each. This size power supply is relatively harmless and will not shock you or damage your generator. Remove the brush pack and set aside. You are going to apply 12-16v AC voltage into the 115v plug of your generator. You should hear a very slight hum in the stator if the winding is not open or shorted. Assuming that the 115v winding is ok, there should be voltage at the commutator rings and the armature should actually be making a magnet force. You can turn the armature slightly and actually vary the voltage at the rings. If you are getting voltage at the rings then winding and armature are progably ok. Remove the AC power supply and replace the brush pack. Next use the 12-16v DC 1 amp power supply (paying attention to polarity) to replace the voltage regulator. Disconnect the voltage regulator from the brushes and use the DC power supply to power the armature thru the brush pack and start the engine. You should get some low voltage at the 115v outlet and more important some ac voltage at the leads that power the voltage regulator. If no output at the leads to regulator then winding is open or short, if ac is present then regulator is most likely fault. Good luck, hope this helps, enjoy.

Dec 19, 2008 | Coleman Powermate 7,000 Watt 13 Hp...

1 Answer

Suzuki SE4000SED generator with no output

There was a day and time when generators were simple. There were no capacitors, regulators to control/adjust power to magnet or ground fault outlets. Winding getting hot indicates short, however could be bad capacitors. Rectifiers and capacitors must be removed from circuit to test properly. Here is a simple test that I use to find fault area. I use a small power supply (16v AC 1 amp like doorbell transformer) into the 110v outlet of generator. This should energize the armature magnet and actually produce voltage at commutator with brushes pulled off. You can slowly pull the starter rope to move the armature into a different positon the voltage will vary. If the ac windings are shorted there will be very little or no magnet. There is a seperate 110 v circuit at the 220v outlet to test (there are two 110v windings that make up the 220v outlet, one is also used for the 110v outlet). There is another winding that products voltage for the regulator that powers the magnet thru the brushes but I think that circuit is porbably working because of the heat in the windings. You might even have 110v power at the 220v outlet. As our parents told us over and over, be careful when working with electricity. Enjoy

Dec 06, 2008 | Electrical Supplies

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