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Question on Charging system
- jwonder
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Question on Charging system
Any help is appreciated!
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Vice President, Vintage BMW Motorcycle Owners
2022 BMW Friend Of the Marque
Long Island, New York
- wa1nca
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Charging system
Any help is appreciated!
I think I have the older regulator in my r51/3
I will check tomorrow
Did it ever work or just stop charging?
The D+ terminal is one of the yellow wires coming out the field coil and is connected to the top brush and also to the blue wire for the charge light
The other yellow wire is the Field wire going to the regulator
The low reading you are getting is because the commutator and charge light is in parallel with this and at least one of the field windings needs to be disconnected
The statement to measure resistance from D+ to F is misleading as it does not say to separate one of the field wires (it is assumed that you allready have the field coils are out of circuit and to be tested only with no parallel resistance
I will verify this tomorrow
To bypass the regulator you can disconnect the field wire to the regulator and ground it and the charging should put out max voltage
looks like your regulator is cooked and the burn spots on the commutator indicate the that you may have a bad armature The test from "understanding and maintaining the BMW /2 electrical system" only shows the commutator is not shorted to the armature and between each segment on the commutator is .1 ohm not 0 ohms
If your brushes are in good shape and the regulator is bypassed and passes the commutator test then its likley you still may have a bad armature
This only be tested by a Growler which introduces a magnetic field into the armature to see the current is not shorted to the outside of it and going only to the commutator contacts to produce a output to the regulator and then to the battery and load
Any good electrical shop should have one
Sadly most don't today as it is a plug and play world
I do have one and can test the armature if needed
Phone
413 628 3958
Tommy
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54 R51/3, 55 R50/Velorex 560 sidecar, 64 R27, 68 R69US, 75 R75/6
Ashfield, Ma
USA
- jwonder
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Thank you!!
Vice President, Vintage BMW Motorcycle Owners
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Long Island, New York
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Clean the points,and with key
R69S - R60/2 - R67/2 - R51/3 - R69
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Benchmarkworks 12 volt system
- jwonder
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Charging system works!
1) I purchased the Doug Rinckes book off lulu.com and I can say it is a great reference.
2) I cleaned the commutator with light scotch bright and some electronics cleaner. I really only needed the cleaner as it was dirty, not burned.
3) I set the point gaps on the regulator exactly as he outlined and learned more about how the thing functions.
4) I started it and adjusted the no-load voltage to 7.9volts as instructed.
5) I ran all the tests he listed and the only one I am out of specification on is the cut-in voltage. I am a bit high at 7.2-7.4 volts but its hard to tell exactly by watching two multimeters. I am just a bit above spec here and figured I would leave it alone and not play with it.
6) I tested the load voltage and it is all in specifications
7) I forgot about buying an electronic regulator, for now!
I have not ridden the motorcycle (see my other thread) yet but I do not see as I will have any issues.
So far so good.... No on to the cylinder!
James
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2022 BMW Friend Of the Marque
Long Island, New York
- jwonder
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Another issue!!
Sadly, I am done with the mechanical regulator and a new electronic one is on its way!
While I was checking everything I took everything apart to test and I found that there are several armature segments that look like they have contacted the fields magnets (or had been dropped on the floor) at one time. The small segment on 2 or 3 of the armature segments are moved (see picture). I measured the resistance and every thing seems to be in order and nothing seems out of spec but I wanted to ask the group your thoughts on the damage to the armature segments.
Any help is appreciated!!!!
Thank you!!!
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Vice President, Vintage BMW Motorcycle Owners
2022 BMW Friend Of the Marque
Long Island, New York
- wa1nca
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armature damage
looks like damage was caused by it was rubbing on one or more of the 4 field coils
check that the field coils are not loose and are parallel to each other
you should see the one or more of the field coils also have wear marks
I would say the armature is junk at this point and now would make sense to upgrade the charging system
the cost of a new armature and replacement field coils would justify a overhaul
worst case the front crankshaft bearing is also bad or the crankshaft has excessive runout but think you should have heard some noise while driving
Tommy
54 R51/3, 55 R50/Velorex 560 sidecar, 64 R27, 68 R69US, 75 R75/6
Ashfield, Ma
USA