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Generac Generators (SEARS, etc.)

Generac 20kw HSB generator field boost diode


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Old 03-30-2019, 11:02:18 AM
BlkBeard BlkBeard is offline
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Default Generac 20kw HSB generator field boost diode

Good Morning All;

I have a Generac 20kw 2012/2013 Guardian HSB Generator model 0058871
Controller # 0h6680D

I'm looking for the location of the Field Boost Diode which isolates wire #4 from wire #56

Does anyone have a picture of this part?

I've followed the positive brush lead (wire#4) as far as I can. Today will be a balmy 60 degrees so I'll take another stab at finding it.

The Generator shuts down immediately on start-up error code "under voltage" Which according to the manual occurs when voltage is not present at the time of starter disengagement.

Thank you in advance for any & all help
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Old 03-30-2019, 11:36:02 AM
Birken Vogt Birken Vogt is offline
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Default Re: Generac 20kw hsb generator field boost diode

https://www.generator-parts.com/manu...dby/0H9172.pdf

I take it you are looking on page 284 of the above document

That is the "wiring diagram" which more closely follows the actual wires than the "schematic" which is more to help you figure out how it all works together.

In the WD it shows a butt splice on wire 56 and another on wire 4 between which is the diode.

I presume this would be right near the controller because the SCR (Starter Contactor Relay) is right in the same area of the controller. So wire 56 between the back of the controller and terminal A of the SCR is not a long wire, and the diode should be found in the middle of it somewhere.
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Old 03-30-2019, 04:36:51 PM
BlkBeard BlkBeard is offline
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Default Re: Generac 20kw hsb generator field boost diode

Found it.
Everything is much easier on a warm day
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Old 03-30-2019, 05:12:36 PM
Birken Vogt Birken Vogt is offline
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Default Re: Generac 20kw hsb generator field boost diode

Was it the source of trouble? Never had one fail that I can remember.
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Old 04-01-2019, 08:10:09 AM
BlkBeard BlkBeard is offline
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Default Re: Generac 20kw HSB generator field boost diode

The problem was the controller failed. But I wanted to test the field boost diode before plugging in an expensive part. Just a matter of measure twice & cut once.
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