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1Back to top Go down   Alternator parts Empty Alternator parts Sat Apr 05, 2014 12:58 am

Bigsax

Bigsax
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I had some weird electrical issues I tracked down to the alternator not working.
I used my trusty Haynes workshop manual to work see how to change the regulator and bushes. It is easy but getting a replacement was not so easy. When you give suppliers the part number on the regulator they shake their heads, when you tell them it is for your 30 year old K bike they just about piss themselves laughing!
Anyway Bosch part #1197311090 fits & works & replaces #1197311001 and my local supplier had one on the shelf.


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Alternator parts Brick110
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2Back to top Go down   Alternator parts Empty Re: Alternator parts Sat Apr 05, 2014 1:14 am

blaKey

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Did you try ebay?


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K100RS 1986 RED!

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3Back to top Go down   Alternator parts Empty Re: Alternator parts Sat Apr 05, 2014 1:32 am

charlie99

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yep hard to find someone serious bigsax .....but the regulator is pretty common ...as you found ... always best to tell them that its a 30 amp bosch unit ...   don't mention its from a bike though ...just say its out of a vw

id be interested to see what your voltages are after it has charged the battery fully ....be aware that there are what they call the "city type" regulators ...made to charge at about 14.2 (reason being that short runs all the time ) and the "country type" which sit about 13.8

just so you are aware ....the 14.2 burn off the electrolyte pretty quick ...so 6 monthly refils are recommended .


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cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%OAlternator parts Au-log10

'86 k100 rs.. #######..  "Fred " (f(rame) red ) ( Fredrick leichtundschnell ) - -
bits and pieces from many kind friends across the k100 world ...with many thanks ..
    

4Back to top Go down   Alternator parts Empty Re: Alternator parts Sat Apr 05, 2014 2:49 am

Bigsax

Bigsax
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@charlie99 wrote:yep hard to find someone serious bigsax .....but the regulator is pretty common ...as you found ... always best to tell them that its a 30 amp bosch unit ...   don't mention its from a bike though ...just say its out of a vw

id be interested to see what your voltages are after it has charged the battery fully ....be aware that there are what they call the "city type" regulators ...made to charge at about 14.2 (reason being that short runs all the time ) and the "country type" which sit about 13.8

just so you are aware ....the 14.2 burn off the electrolyte pretty quick ...so 6 monthly refils are recommended .
Getting 13.8.

STILL NOT FIXED MY PROBLEM GRRRR.

Just been out for a run and the battery ran flat & electrics started playing up again. What am I missing?


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Alternator parts Brick110
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5Back to top Go down   Alternator parts Empty Re: Alternator parts Sat Apr 05, 2014 2:54 am

charlie99

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where are you measuring ? at the battery terminals ?

ricks post a couple of days ago about the alternator earths etc is well advised

is the charge indicator lamp operational ?

is the under tank earths all good ?

is the main earth cable corroded - lossy ...many have replaced theirs totally

alby did a small kit for the main earth wire ...increased it by nearly double

he may still have a couple

or it is just a dud battery now ?


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cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%OAlternator parts Au-log10

'86 k100 rs.. #######..  "Fred " (f(rame) red ) ( Fredrick leichtundschnell ) - -
bits and pieces from many kind friends across the k100 world ...with many thanks ..
    

6Back to top Go down   Alternator parts Empty Re: Alternator parts Sat Apr 05, 2014 2:59 am

Bigsax

Bigsax
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Checking current at the battery terminals. Something strange though, the current does not charge at idle, it only picks up at about 2500 revs. The battery charging indicator light stays on initially but goes out as soon as 2500 is reached and stays out. The main battery earth lead is good as new, I have not looked at the others yet.


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Alternator parts Brick110
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7Back to top Go down   Alternator parts Empty Re: Alternator parts Sat Apr 05, 2014 3:08 am

charlie99

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2500 that's a little high    normally about 1200-1500 is when the lamp extinguishes


how are the money nuts (in the coupling between the motor and front of the alternator )

did you inspect the slip rings (copper bits that the brushes run on ) around the armature of the alternator

they should be clean and shiney if not get a bit of scotch bright and make it so ...
I have seen those rings stuffed from bad brushes becoming too short and driving into the slip rings at an angle ...but usually they just don't reach any more with age .

unless you have cracked a brush during the installation ....I usually hold them back with fishing line whilst working them into the right location ...just before doing the bolts up \
\


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cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%OAlternator parts Au-log10

'86 k100 rs.. #######..  "Fred " (f(rame) red ) ( Fredrick leichtundschnell ) - -
bits and pieces from many kind friends across the k100 world ...with many thanks ..
    

8Back to top Go down   Alternator parts Empty Re: Alternator parts Sat Apr 05, 2014 3:13 am

Bigsax

Bigsax
Gold member
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@charlie99 wrote:2500 that's a little high    normally about 1200-1500 is when the lamp extinguishes


how are the money nuts (in the coupling between the motor and front of the alternator )

did you inspect the slip rings (copper bits that the brushes run on ) around the armature of the alternator

they should be clean and shiney if not get a bit of scotch bright and make it so ...
I have seen those rings stuffed from bad brushes becoming too short and driving into the slip rings at an angle ...but usually they just don't reach any more with age .

unless you have cracked a brush during the installation ....I usually hold them back with fishing line whilst working them into the right location ...just before doing the bolts up \
\
Thanks Charlie, I will try cleaning up the slip rings, they did look a bit sooty and the old bushes were really short. 
I am off to do it now and will report on results..


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Alternator parts Brick110
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9Back to top Go down   Alternator parts Empty Re: Alternator parts Sat Apr 05, 2014 3:15 am

charlie99

charlie99
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good luck mate


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cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%OAlternator parts Au-log10

'86 k100 rs.. #######..  "Fred " (f(rame) red ) ( Fredrick leichtundschnell ) - -
bits and pieces from many kind friends across the k100 world ...with many thanks ..
    

10Back to top Go down   Alternator parts Empty Re: Alternator parts Sat Apr 05, 2014 4:09 am

Bigsax

Bigsax
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No good, now no charge from the alternator at all! And the starter is now playing up. When it rains it pours!
Looks like an alternator rebuild.


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Alternator parts Brick110
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11Back to top Go down   Alternator parts Empty Re: Alternator parts Sat Apr 05, 2014 4:14 am

charlie99

charlie99
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better post up a pic of what you see ...did the terminals go back on and clean from the wiring harness , how did you turn the alternator to get to all the slip rings ...that was mighty quick unless you used the motor to turn it ?


you didn't pop a fuse in the process ?


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cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%OAlternator parts Au-log10

'86 k100 rs.. #######..  "Fred " (f(rame) red ) ( Fredrick leichtundschnell ) - -
bits and pieces from many kind friends across the k100 world ...with many thanks ..
    

12Back to top Go down   Alternator parts Empty Re: Alternator parts Sat Apr 05, 2014 5:51 am

RicK G

RicK G
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Most likely the starter is giving static because the battery is low.  Charge the battery and take the alternator to a auto lecky and get an opinion.


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"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


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13Back to top Go down   Alternator parts Empty Re: Alternator parts Sat Apr 05, 2014 6:31 am

Bigsax

Bigsax
Gold member
Gold member
@charlie99 wrote:better post up a pic of what you see ...did the terminals go back on and clean from the wiring harness , how did you turn the alternator to get to all the slip rings ...that was mighty quick unless you used the motor to turn it ?


you didn't pop a fuse in the process ?
Yep, used the starter motor (now giving me trouble) to turn it. And cleaned the terminals. I can now strip the battery etc out in times that would impress formula one teams.

I even tried putting the battery charger on when she was running to see if the boosted charge would turn off the instrument warning light. No.

Anyway, so now the starter is playing up and I decided to remove it. I have so far sheered the head off one of the retaining bolts!

I am now typing this with a philosophical glass of red in one hand and the remains of the bottle not out of reach.


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Alternator parts Brick110
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14Back to top Go down   Alternator parts Empty Re: Alternator parts Sat Apr 05, 2014 6:35 am

charlie99

charlie99
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um settle on that for the night

do not go out there again ....till tomorrow is well and truly dawned ...

grin

things often look differently in the new day


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cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%OAlternator parts Au-log10

'86 k100 rs.. #######..  "Fred " (f(rame) red ) ( Fredrick leichtundschnell ) - -
bits and pieces from many kind friends across the k100 world ...with many thanks ..
    

15Back to top Go down   Alternator parts Empty Re: Alternator parts Sat Apr 05, 2014 3:20 pm

kioolt

kioolt
Silver member
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It's possible that you may have a bad diode in the alternator.  The diodes are not part of the regulator.


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2004 R1150RT 186,800 miles 
1991 K100LT 128,700 miles
1982 R100RT 106,900 miles
Total 422,400 BMW miles

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