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R26
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NorCal
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Hello

I did some reading prior to posting without any luck. Components are new to me and have no idea if they worked previously. Currently I get 0V coming out of the generator. Field coils read 2 Oms and armature appears to have no damage.
Bench checks as well using the manual found here. Brushes are new. Terminals have been checked for faulty ground. I have an electronic regulator.

Let me know if I am missing anything. Or any troubleshooting tips.

Many thanks

Sergio

312Icarus
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Try a different set of

Try a different set of brushes? Clean the commutator? Check that the springs are holding the brushes in properly? (I might suggest the electronic regulator, but since I don't know a test with out it I can't give it to you) Where and how are you checking the voltage?

Good luck and keep in touch.

Icarus

R26
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Thanks !

Commutator is clean. Brushes are new.

I have been checking for voltage in a few different spots. Between terminal #61 and ground as well as # 30/51 and ground. Low and high rpm.

Is it possible to check for output without the voltage regulator connected ? And where ?

312Icarus
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With the old mechanical

With the old mechanical regulator, you could disconnect the field, which would effectively drop the voltage to zero. The mechanical regulator would do that many times a second to give the voltage constant.

My WAG is that the regulator is failing to energize the field.

Icarus

R26
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Hm...

Very possible that the field coils are not getting energized.

wa1nca
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VBMWMO #8374
Ashfield Ma.
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Bypass voltage regulator

If you disconnect the field wire from the mechanical or electronic voltage regulator and bring it to ground you will force the generator for its max output
30/51 on meter and ground

Tommy

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Tommy Byrnes
54 R51/3 55 R50 64 R27 68 R69US 68 Sears Allstate 250 (Puch)

R26
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Thanks !

wa1nca wrote:

If you disconnect the field wire from the mechanical or electronic voltage regulator and bring it to ground you will force the generator for its max output
30/51 on meter and ground

Tommy

Just tried it. Still no output.

808Airhead
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Before making assumptions

Before making assumptions install the regulator and see what transpires. I have never tested generators without a regulator on there. Unless you have shorted commutator bars or broken field windings everything should work. Put it together and let her rip. I have electronic regulators in mine and they will not work with a dead battery. The mechanical regulator will charge a dead battery,but the electronic one needs to be excited by atleast 5 volts. Have fun! My electronic regulators work great I hope you have the same experience.

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Thomas M.
R69s - R60/2 - R67/2 - R51/3

R26
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Thanks !

I did try with and without the electronic regulator.

wa1nca
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VBMWMO #8374
Ashfield Ma.
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/2 electrical info by Doug Rinckels

http://www.snafu.org/restore/uandm_bmw_v1.pdf

Have you tried to repolarise the field windings in the generator

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Tommy Byrnes
54 R51/3 55 R50 64 R27 68 R69US 68 Sears Allstate 250 (Puch)

R26
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I think so

The way I've read it. By introducing battery current briefly to the two yellow wires using the correct polarity. Not very familiar although.

wa1nca
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VBMWMO #8374
Ashfield Ma.
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repolarise the generator

Battery positive to D+ on the regulator briefly not the 2 yellow wires
D+ is also same as the small blue wire on the generator

Tommy

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Tommy Byrnes
54 R51/3 55 R50 64 R27 68 R69US 68 Sears Allstate 250 (Puch)

R26
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Thanks !

I might just pull everything out and swap with the powerdynamo. Can't beat the 12V anyways

R26
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Update

Powerdynamo was installed today. Everything works as advertised. The system it is very well made. The only thing I had to redo was the bracket attaching clamps under the fuel tank. There wasn't enough clearance between the tank and the clamps using the stock hardware. No biggie.

Next project ....replacing the rubber Pagusa seat cover. Wish me luck !

Thanks guys for your assistance. Cheers!

Sergio

schrader7032
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VBMWMO #7032
San Antonio, TX
Joined: 10/27/2006
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Replacing Seat Cover

R26 wrote:

Next project ....replacing the rubber Pagusa seat cover. Wish me luck !

You're going to need it! Mine finally gave out on my R25/2 and I had one helluva time getting a new one on. I had the help of some work friends and ended up building a box frame to stretch the rubber out so the internal frame could be assembled. I posted my trials and tribulations here on the forum.

http://www.vintagebmw.org/v7/node/14073

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'78 R100/7 '69 R69S '52 R25/2

R26
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Thanks Kurt !

I don't have anyone near by so it will have to be a "one man job" Smile

R26
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NorCal
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Done !!!

Happy to report that the seat is in. Package came in yesterday and got started this morning. I did use a wooden frame with scrap wood laying around the house, nylon rope and a ratchet pulley. Pretty much what everyone else did. One thing I did differently is the way I've attached the front part of the metal frame. I've used two loops of nylon rope one on each side of the frame around each metal tab.

I can confirm that it is quite the task !!!

Cheers

Sergio

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