How to Flash a Generator With a Battery? [Best Easy Way]

Firstly, I want to define what the generator is and then I will guide you How to Flash a Generator With a Battery? The electricity generator mainly transforms motive power (mechanical energy) into electrical power for utilization in an external circuit. Generators provide nearly all the power for electric power grids.

For fleshing the generator with a battery, you need to connect the battery +12 volts (red cable) to the red wire on the terminals you removed for three seconds. Apart from that, you need to eliminate wires and replace the plug. Next, the generator will start to produce power again. Lastly, you must ensure that you unplug the brush Wire from the automatic voltage regulator.

There are other more factors and points to be noted before fleshing generator, If Done incorrectly can make trouble. So It is important to follow this guide correctly in order to flesh your generator correctly.

How to Flash a Generator With a Battery?

What Do You Need To Do To Flesh A Generator With A Battery?

Furthermore, now I want to provide you with a detailed note about how you can flesh a generator with a battery? In this regard, the below-mentioned information is going to support you.

Residual magnetism in the generator exciter field permits the machine to generate voltage while starting. Mainly, magnetism is sometimes lost because of shelf time or uncertain implementation. You can easily restore this residual magnetism by “Fleshing the exciter field”. 

For restoring the mini amount of residual magnetism, it is essential to generate voltage. On the other hand, you need to join a 12-volt battery to a current limiting device with the exciter field, as follows.

First, you are required to withdraw the exciter field leads F+ and F- from the voltage regulator.


For instance, If you fail to remove the field, it can lead from the regulator during flashing procedures and may destroy the whole system of the regulator. 

Secondly, you should measure the exciter field resistance from the F+ to the F- lead. You must be capable of translating some resistance for measuring an uninterrupted turn. The never-ending resistance reading will show an open symbol to the exciter field. You must ensure that there is nothing on the ground while working.

Thirdly, you need to connect F+ to the positive pole of the battery so that you can proceed ahead.

Fourthly, after that, you should hold the F- led by the insulated portion of the lead wire then, touch F- to the negative pole of the battery for about 3 to 5 seconds, then remove. After that, look for an arc upon Disconnecting the F-lead. Congrats! The ARC confirms a complete circuit.

You are almost there, now you must reconnect F+ and F- to the regulator.  However, repeat the procedure if the generator fails to build voltage.

This is a generic procedure, and some generator ends may require a higher DC voltage or a limiting resistor in series with the battery leads.

Some Important Tips To Be Noted For Fleshing A Generator With A Battery

Mainly, the generator depends on residual magnetism in the field. The core begins and generates a small amount of electric current in the armature windings as soon as the shaft starts moving around.

This is very harsh because reinforcing the field magnetism and increasing the generator output voltage relay coil in the regulator to pull in the contacts that connect the generator output to the battery.

If the generator is not in use for a long time or is banged around in the back of a pickup truck, or is driven mechanically without being connected to the battery through the regulator. There are chances that the magnetism in the field core can be lost completely.

Suppose you want to restore this residual magnetism for this reason. In that case, it is necessary to cause current to flow through the field winding.

For a negative ground system, you need to connect a wire to the battery’s positive terminal and momentarily to the field terminal of the generator. Eventually, this will result in a spark or flesh. That is where the term flashing the field arrived from.

Normally, one or two flashes are sufficient to restore the residual magnetism long enough to get the generator back to normal operation.

As long as the residual magnetism lives, the generator can start with a completely dead or non-existent battery. That is something that an alternator can not do.

For this, you must note that the current must be supplied by the battery, also in an alternator from the stator.

Lastly, you should know that some generators have only two terminals. That means the one brush (the negative one) and the other are connected internally to the generator frame.

On the other hand, there should be a screw or stud on the generator that should be connected to the airframe of the battery’s negative terminal. In case, if there is not, then there could be one reason the field needs flashing.


How to flash a generator when output is lost due to loss of excitation?

First remove the exciter field leads F+ and F- from the voltage regulator, then measure the exciter field resistance from the F+ to the F- lead, next connect F+ to the positive pole of the battery. Lastly, reconnect F+ and F- to the regulator, repeat the procedure. You are done!

Does a generator slowly lose its residual magnetism with time?

Yes, it can happen only in one case, especially when the self-excited generator is not being used for a very long time. There are high chances of residual magnetism.
But you do not need to worry, here I have a simple trick. However, you can easily re-built the loss of residual magnetism by connecting fields.

Why does my generator run but not produce electricity?

The main reason behind this is the generators usually fail to produce electricity when there is a loss of residual magnetism.

Final Thoughts: How to Flash a Generator With a Battery

Generators are important to power your devices and equipment whenever there is a power outage. But it might be trouble if you need power urgently and your generators need fleshing. So with a battery, you can easily flesh your generator.

There are other ways too to flesh a generator but their techniques are different from the battery fleshing.

I hope this piece of writing assists you in knowing how you can easily flash a generator with a battery? Whatever the information I have defined was based on my deep research of this term. 

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