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12 volt generator Bosch
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pernest
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PostPosted: Mon Mar 20, 2023 11:40 am    Post subject: 12 volt generator Bosch Reply with quote

Amazon sells Bosch 12v 0101302111 compatible? Generators. The armature on my old Bosch is toast ó itís arching. Would love to hear some opinions on the new Bosch 12v generators.
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jinx758
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PostPosted: Mon Mar 20, 2023 1:14 pm    Post subject: Re: 12 volt generator Bosch Reply with quote

Howdy ...

"New" Bosch is probably Taiwan or China, heck Mercedes is Brazilian now.

Mite be worth it to have a local shop do a rewire/rebush/rebuild but week a specialist.
You could easily take brushes out to inspect them & the armature for scoring & excessive carbon build up.

Best luck ... jinx
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pernest
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PostPosted: Mon Mar 20, 2023 2:37 pm    Post subject: Re: 12 volt generator Bosch Reply with quote

A local shop inspected it today and said the armature is no good and is arching. So itís either get a new generator, alternator, or armature for the old generator which I believe is Brazilian.

Amazon is pretty good at returns so Iím thinking of getting a ďBoschĒ thru them with a cheap protection plan.
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jinx758
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PostPosted: Mon Mar 20, 2023 5:19 pm    Post subject: Re: 12 volt generator Bosch Reply with quote

Scam - a - zon ...

Fingers crossed !
Protection plan is a good idea, too.

Hope it lasts ... stay safe

jinx
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POINTS
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pernest
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PostPosted: Mon Mar 20, 2023 7:53 pm    Post subject: Re: 12 volt generator Bosch Reply with quote

Thanks Jinx!
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pernest
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PostPosted: Thu Mar 30, 2023 4:50 pm    Post subject: Re: 12 volt generator Bosch Reply with quote

Update

I found a new/ rebuilt generator at NAPA ó an exact replacement.

Installed it but the red light stayed on. Took the generator to a respected shop ó his testing led him to say it should work. Reinstalled it but the red light is still as bright as ever.

I hooked a wire between the DF contact and the generator ground screw, started the car, then hooked my battery voltage tester leads to the D+ and the generator ground screw. The voltage needle didnít budge. No voltage at all.

Kind of frustrating!
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bnam
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PostPosted: Thu Mar 30, 2023 5:19 pm    Post subject: Re: 12 volt generator Bosch Reply with quote

You need to first polarize the genereTor. Please look up that procedure. Easy.

https://www.thesamba.com/vw/forum/viewtopic.php?t=337164&highlight=polarize+gen
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heimlich Premium Member
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PostPosted: Thu Mar 30, 2023 6:03 pm    Post subject: Re: 12 volt generator Bosch Reply with quote

New Bosch generators are still made in Mexico along with the Alternators. The production has not moved to another country as of yet.

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pernest
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PostPosted: Fri Mar 31, 2023 7:54 am    Post subject: Re: 12 volt generator Bosch Reply with quote

Thanks bnam.

Got generator to spin as described in your attachment and retested for output. Itís putting out some pretty good voltage and Iím convinced itís working fine. Will go to next step and check regulator. Thanks!
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pernest
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PostPosted: Fri Mar 31, 2023 4:37 pm    Post subject: Re: 12 volt generator Bosch Reply with quote

Started the car today and the generator light went off briefly but came back on after just a few blocks. The brake light came on for no reason ó the brakes are working fine.

Did some more testing later. Voltage across the battery was 12.3 before cranking. At idle it was 12.1. Never got over 12.2 when racing the engine. A post that I saw suggested testing for system voltage but did not tell how. Prior testing showed that the generator is capable of producing 35 volts plus (unregulated) so I think itís working fine.

I would like to solve the problem myself without having to take the car to a shop. Thanks for the help you have given me on this.
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goober
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PostPosted: Fri Mar 31, 2023 10:55 pm    Post subject: Re: 12 volt generator Bosch Reply with quote

Check to make sure the brushes move freely in their holders.
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heimlich Premium Member
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PostPosted: Sat Apr 01, 2023 8:56 am    Post subject: Re: 12 volt generator Bosch Reply with quote

You can also clean up the area where the brushes rub. Take some very find sandpaper to it.
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pernest
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PostPosted: Sat Apr 01, 2023 11:31 am    Post subject: Re: 12 volt generator Bosch Reply with quote

Per instructions below, I tested the ďnewĒ generator installed and it more than exceeded the 35 volt requirement when I raced the engine.


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See photo of old voltage regulator. The information above suggests itís probably no longer working. The red light continues. Thanks all.


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pernest
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PostPosted: Mon Apr 03, 2023 2:06 pm    Post subject: Re: 12 volt generator Bosch Reply with quote

Happy ending (maybe). Hate just throwing parts at a problem and I noticed that my battery cables fit loosely over the posts but were not tight. I tightened them with the result that the red light went out and the battery is being charged when the car is running.

The old generator was arching but it appears the old regulator is working fine. Thanks for the info you provided ó it helped a lot!
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