My Blitz's

[Mike K]

Originally Posted by Scott Hamilton

Yes please Phil, if you could post those diagrams.

I do have parts and maintenance manuals which only have the versions with the bushing at the rear of the generator and without the air filter.

How do I go about polarising the magnets ? - as there is no mention of magnets in the parts description, unless you mean the generator pole shoe that the coil is fitted around?

Scott

The field coils are wound around a hunk of cast iron . The iron needs an amount of residual magnetism in order for the generator to " start up" , once it gets going . This magnetism is polarised in either of two ways . If you have a NEG ground system, the coils need to be polarised for a NEG ground .

You normally just touch a wire from the battery HOT SIDE to the field coil terminal , this is enough to polarise the coils

MIKE

[Phil Waterman]

Hi Scott

Below is the parts break out view, and the link to the parts pages that go with it. Hope this helps.

My experience is that the generators have to energized as Mike describes, the manual also describes a number of test for the generator including a motor test. I have found that the energizing step should be the last and if the generator sits around not connected for a long time may have to be repeated. I've ended up doing it after the generator is installed on the engine and fails to charge when the is running.



http://canadianmilitarypattern.com/M...0Up%20Link.htm This page is where I've started storing photos I want to up load at larger size or higher resolution to present on MLU. If the size is a problem for your browser or web connection please let me know.

Cheers Phil

[Lynn Eades]

It would probably be o.k., But.....
It would be better to polarize a generator every time one is fitted to a vehicle.
This way it has to be right.
If it is not done, and is wrong,(50%chance) what happens is that when the engine stops the cut out contacts in the regulator stay closed.The current from the battery back feeds to the geny which tries to "motor". The geny cannot motor, being held by the fan belt. The net result is that the geny burns out, along with the cut contacts, essentially wrecking the regulator.
For the sake of connecting the live terminal of the battery with a wire, and making it spark on the small terminal (field terminal) of the fitted geny, it saves all the grief.
This is the case when your vehicle is earthed either positive or negative.

[Phil Waterman]

Hi Scott

I agree with Lynn on polarizing the generator after it is installed on the truck. I've found that the that doing it before it is installed doesn't always work or hold the field. Lynn is also correct about the very brief contact necessary to accomplish the polarizing just a quick spark.

The caution about making sure that the regulator is functioning correctly when the engine is turned off, read the section in the manual and be sure that the cut out points in the regulator are actually opening.

Which manual are you working from?

Cheers Phil

[Ryan]

May she rest in peace Scott. All the best to you and your family.

[hrpearce]

Scott our thoughts and prayers are with you and your family, the Pearce's.

[John Mackie]

i have been reading the above posts about polarising generators. one thing you have to be aware is that there are TWO different ways to connect the field windings in a gene.
Autolite and Ford connect the winding between the terminal and ground.
Delco R . and Bosch connect the winding between the LIVE brush holder and the field terminal. Applieng power to the field terminal on a delco gene will cause the current flow through the field winding in the reverse direction to normal. it is ok to " flash " the field term. on a ford gene as this is the normal direction of current flow.
the way i was tought to test a gene was to "motorise " it. On a Delco. gene apply 6 volts to the output tern. and earth the field terminal as well as the case . on a Ford gene. connect 6 volts to both the armature and field terminals earthing the case. In both cases the polarity has to be the same as you want to use
The gene should rotate at about 600 rpm and draw about 6 amps. Gently load up the gene with a small pice of wood . the gene should not show any signs of jerking and the amps will increase to about 15 . watch out for excessive current or heating. the gene is also polarised to the way the batery was hooked up.
I hope this solves some of the mysterys,

John.