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Old 04-20-2020, 11:00 AM   #1
DRG-ler
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Default Does anyone know this generator?

Hi Guys.

I would like to replace the electrics on my Model A. My previous owner had tried that before. Unfortunately, he didn't use proper cables. Too thick and all in the same color.

I want to change that now and also retrofit some things. In the course of this, I would also be interested in the type of generator my previous owner installed. The car is currently running at 6V, positive ground.

To install a radio, however, I need negative ground.
Is it enough to replace the sheet metal on the generator with the cable connection? What else needs to be reversed? Battery is known ...
Ignition coil? Horn? Ammeter? What happens to the starter?

How much power does the generator have?
Then the generator has two plug connections on the side. What are they for or what can they be used for?
The following inscriptions can be seen on the top:
115627
76A
6B13
12VNEG

The problem is, it's definitely a 6V generator !!! The 12VNEG cannot be correct. It is therefore questionable whether the 76A is also correct.

My aim is to be able to determine which cable diameter I need for the line to the ammeter.


Some Pics...




Greetings from Berlin

Andy
Written with Google Translator.

Last edited by DRG-ler; 04-20-2020 at 01:23 PM.
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Old 04-20-2020, 11:03 AM   #2
BRENT in 10-uh-C
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Default Re: Does anyone know this generator?

Andy, -actually, that is NOT a generator, ...but was originally a GM Delco Alternator that has likely been converted to 6 volts by changing the internal voltage regulator. You can either replace the regulator, ...or you can convert it back to the correct style generator.
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Old 04-20-2020, 11:13 AM   #3
DRG-ler
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Default Re: Does anyone know this generator?

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Last edited by DRG-ler; 04-20-2020 at 11:30 AM.
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Old 04-20-2020, 11:23 AM   #4
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Old 04-20-2020, 11:32 AM   #5
jrelliott
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Default Re: Does anyone know this generator?

It is a single wire alternator. If it is the early Delco, you can easily get 35 Amps. The two terminals you allude to are for the field and remote voltage sense. The regulator that is used in the single wire alternator does not need these external connections. You cannot convert from a 6V Positive ground alternator to 12V negative ground. Takes a lot of connections inside and a different regulator. The alternator puts our 3 phase AC and the diode packs converts the AC to DC either positive or negative depending on the diodes and connections. Just a short overview.
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Old 04-20-2020, 01:14 PM   #6
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Default Re: Does anyone know this generator?

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Quote:
You cannot convert from a 6V Positive ground alternator to 12V negative ground.

No, but I think maybe I could switch to 6V neg. Ground.
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Old 04-20-2020, 06:28 PM   #7
Kurt in NJ
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Default Re: Does anyone know this generator?

the conversion looks to be that the terminal that originall grounded to the housing was insulated and brought out----the original + terminal has the strap, if that is moved to the other terminal it would change the polarity
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Old 04-20-2020, 08:38 PM   #8
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Default Re: Does anyone know this generator?

Andy, Keep it simple, buy a small rechargeable sealed 12 volt battery and use it to power your radio. I am assuming you will not be using high wattage speakers. The battery can be placed under a seat and is approximately 150mm x 50mm x 95mm. I have one to run my GPS.
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Old 04-21-2020, 04:08 AM   #9
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Default Re: Does anyone know this generator?

For wire sizes, this conversion chart could be useful:

https://1xtechnologies.com/mm-to-awg/
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Old 04-21-2020, 04:10 AM   #10
DRG-ler
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Default Re: Does anyone know this generator?

Thank you.
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Old 04-21-2020, 04:23 PM   #11
rocket1
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Default Re: Does anyone know this generator?

one way you can tell it is an alternator is to start the engine and touch a screw driver to that round cap on the back,it will pull the screw driver blade for it is an electro magnet now,
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Old 04-22-2020, 10:03 AM   #12
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Default Re: Does anyone know this generator?

Your alternator looks very similar to the 10Si, but appears to have reversible polarity - just change the ground strap and wires to their opposite terminals. Too easy???

On reflection, it can't be that easy. The regulator must be connected to the output post, (polarity reversed). Which means it will require, at least, some internal wiriing changes. You might consider buying a new one.

Last edited by Badpuppy; 04-22-2020 at 05:52 PM. Reason: Too easy
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Old 04-23-2020, 03:43 PM   #13
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Default Re: Does anyone know this generator?

Thanks Badpuppy, you are not wrong! The alternator may not be a 10Si, but it is a 12Si. The successor model, if you can trust the cooling air openings and the fan wheel. Based on your testimony, I found this website.

http://www.madelectrical.com/electri...elcoremy.shtml

Here you can see the differences between the two alternators. At least the outer case is from this. Unfortunately, I do not know whether Delco Remi had a 6V version with switchable polarity available from the factory, or whether this is a self-made conversion. So I'm still a little afraid to just swap the connectors.

Greetings Andy
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Old 04-23-2020, 11:21 PM   #14
Kurt in NJ
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Default Re: Does anyone know this generator?

It has been modified, normally the negative is a screw to the case from the inside, it has been modified with insulated post, the normal positive post has been grounded with the strap, one of the screws from inside is xtra long near the negative post, looks new---the length of the link away, this modification allows standard internal componets, and connections, the insides work as a normal negative ground alternator,the stampings on the case are from it's previous life, these alternators got rebuilt and mixed around parts a lot

another option is old blaupunkt radio --from the 60s, usually can be 6V-12v, + or _ ground by moving internal switches, the tape input can be converted to work a bluetooth on many of them
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Old 04-24-2020, 10:23 AM   #15
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Default Re: Does anyone know this generator?

From what I can find, the 10Si and 12Si are internally identical. As Kurt says, it has been modified, but I don't see why. The regulator has surely been replaced, since I don't believe GM ever produced any 6V alternators.

You may be able to convert back to negative ground by only making some connection changes. This site may have some useful information (bottom of page) -

https://alternatorparts.com/10si-alt...-and-kits.html
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Old 04-24-2020, 01:15 PM   #16
Kurt in NJ
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Default Re: Does anyone know this generator?

One of the parts dealers were selling them, it was probably a good 7 years ago, at Hershey, it had the instructions---for + put strap to one set of posts, for negative the other set of posts, ----

The rebuilder I used to get parts from always said that these were the best alternators made ---cheap parts, easy to rebuild, and they lasted just long enough that the repeat customers were ok with doing it again----

for me original generators are cheaper

Last edited by Kurt in NJ; 04-24-2020 at 01:30 PM.
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Old 04-24-2020, 01:35 PM   #17
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Default Re: Does anyone know this generator?

Finally found a good schematic, was on the same site -

https://alternatorparts.com/10si-15s...-contents.html

Looks like you need to replace the rectifier bridge and the diode trio. You can probably find the the parts locally; GM is big in Europe (Opel). (Don't forget to move the ground strap.)
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Old 04-24-2020, 05:49 PM   #18
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Default Re: Does anyone know this generator?

Everything but the case, rotor and stator. The kit is for 10si alternator, but should fit 12si also.

https://store.alternatorparts.com/10...rsion-kit.aspx

Last edited by Ak Sourdough; 04-24-2020 at 05:59 PM.
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Old 04-25-2020, 02:08 AM   #19
DRG-ler
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Default Re: Does anyone know this generator?

Thanks again for all messages.

I especially looked at the last link. That is the technology that I have installed. I have an alternator with positive earth.

Then I had the other 6V sets displayed.
https://store.alternatorparts.com/6v...epairkits.aspx

Now when I look at the bottom set (repair set) ... All the parts it contains seem to work with positive AND negative earth.
For me this means that the only difference is the part with the heat sink (apparently the rectifier) ​​and the small additional cable in the conversion kits. Do you think that too?

Furthermore, it is written here in the repair instructions ...
https://alternatorparts.com/10si-15s...al-page-5.html

Quote:
Repeat this same test between the grounded heat sink and the other two terminals, and between the insulated heat sink and each of the three terminals.
Now I actually think that in my alternator both heat sinks are insulated, and the earth connection is made via the metal strip on the back.

Greetings Andy
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Old 04-25-2020, 10:03 AM   #20
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Default Re: Does anyone know this generator?

https://alternatorparts.com/10si-15s...al-page-2.html

After studying the schematic, I finally see how the polarity reversal is accomplished - simply reverse the rectifier. The regulator still operates as negative ground through the diode trio, adjusting field current as the load requires.

Be sure to connect the capacitor to the battery side of the rectifier. You can leave both sides insulated, and move the outer ground strap and wires. That is too easy. You may have to excite the regulator manually the first time.
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