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Old 05-24-2020, 09:56 PM   #1
ford35lh
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Default Testing generators

Is it possible to bench test generators ???

I figured out a way to mount one to my Atlas lathe
and mount a correct diameter pulley to a collet.
I think I am headed in the right direction but would need
to know the generator rpm and how to wire it.

Then again I may be just Rube Goldberg'ing it toward failure.
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Old 05-24-2020, 11:04 PM   #2
31Abone
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Default Re: Testing generators

I rigged up a 1 hp - single phase 115v motor and v belt to generator..worked good enough to get what i wanted to know..can just check with volt meter or can hook up battery and amp meter. if you have lots of energy...speed not to important as long as its fast..Mdl "A" up to 1938+_ gens are third brush so the faster they turn the less they put out..never run it in car not hooked up or wire grounded it will burn out..make sure you spin it in correct direction..One time the showed output on the bench but back in car it would not charge, so back on test stand ,I re-polarized it and that done the trick it worked great thereafter..sc
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Old 05-24-2020, 11:20 PM   #3
flatheadmurre
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Default Re: Testing generators

Do you want to check how it performs as in how much it can put out like we do after a rebuild or do you want a quick way to find out if it works at all ?
A known good voltage regulator and a battery works for testing if it is alive...for performance you need a variable load like the old carbon stack testers.
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Old 05-25-2020, 07:43 PM   #4
ford35lh
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Default Re: Testing generators

I would like to sort out a shelf full of generators and get rid of ones
that have no output. Need to find out the approximate rpm and
a wiring diagram.
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Old 05-25-2020, 11:46 PM   #5
JSeery
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Default Re: Testing generators

The RPM would be anything above a fast idle. Pick a number, say 1500 RPM. The wiring diagram would be the same as the vehicle wiring. But early generators work with a cutout and the later with a voltage regulator.
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Old 05-25-2020, 11:55 PM   #6
flatheadmurre
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Default Re: Testing generators

An old lathe usually just go fast enough to emulate a raised idle if original crank pulley is used...get a late pulley and use the larges sheeve on it.

The so far slickest cobbled together testsetup ive seen was a cheap tablesaw with the blade changed to a pulley.
A wooden V-block mounted to the table and a ratchet strap to hold the generator down.
In with the generator lower the "blade" to tighten belt...push start
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Old 05-26-2020, 09:48 AM   #7
38bill
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Default Re: Testing generators

Quote:
Originally Posted by flatheadmurre View Post
An old lathe usually just go fast enough to emulate a raised idle if original crank pulley is used...get a late pulley and use the larges sheeve on it.

The so far slickest cobbled together testsetup ive seen was a cheap tablesaw with the blade changed to a pulley.
A wooden V-block mounted to the table and a ratchet strap to hold the generator down.
In with the generator lower the "blade" to tighten belt...push start



Love it!
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Old 05-26-2020, 12:23 PM   #8
Karl Wolf
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Default Re: Testing generators

Try motoring the gen.
This is done on a Ford by powering the armature connection and the field, ground the frame. If it spins as a motor, it'll work as a generator.

Karl
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Old 05-28-2020, 08:08 AM   #9
fortyonerag
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Default Re: Testing generators

^^^^^That's what we did when I was a young, green and simple auto elec!
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Old 05-28-2020, 12:59 PM   #10
rotorwrench
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Default Re: Testing generators

A guy I used to work for years ago would clip on a test light rig he fabricated and use a buffing wheel to turn the generator. If it lit the light up then it had some potential for rebuild or further testing for function.
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