BMW K bikes (Bricks)

You are not connected. Please login or register

View previous topic View next topic Go down  Message [Page 1 of 1]


1Back to top Go down   Battery Drain Empty Battery Drain on Mon Dec 08, 2014 5:56 am

Bigsax

Bigsax
Gold member
Gold member
Love my bike (don't we all?) but I am getting to the point where I am starting to look longingly at newer bikes on Gumtree (Craigslist in USA).

The thing that is giving me a love hate relationship is 12v power.

I put a fully charged battery in the the old girl (K100RS) and she starts like a champ and off we ride. After a while I start to loose electric stuff. lights, Indicators etc. But she is still riding just fine. I put a meter across the battery and the alternator is is pumping away as it should. If I stop, I cannot start her again. Not enough power to engage the starter. I can bump start her fine and off we go. With no indicators etc.

I have read almost all the posts on here about electrics and there is a lot of talk about starter motor bushes. Can this drain the battery?

Help, I only have half a dozen hairs left on my head but I am getting close to ripping them out!


__________________________________________________
Battery Drain Brick110
I stole this image, let me know if you want it back.
    

2Back to top Go down   Battery Drain Empty Re: Battery Drain on Mon Dec 08, 2014 7:05 am

RicK G

RicK G
VIP
VIP
It sure sounds like starter brushes to me.  The headlight, indicators are all supplied with power via the load shed relay which gets its earth through the starter and if the brushes are cactus then that relay wont operate and the lights and indicator wont work.
If the brushes are low then it can give you the same slow cranking that a low battery gives. Check the voltage when the starter is cranking and if the battery is low the volts will drop way down like 7 or 8 volts but if the battery is good and the starter brushes are the problem then the volts should not go below about 10 volts which is what I expect will be the case.
WARNING Slow cranking of the starter draws a lot of extra current and this can weld the starter relay contacts together and sometimes fry the relay contacts. Be prepared to disconnect the battery in a hurry.


__________________________________________________
"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


Bikes 1993 K1100 LT, 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 for now
    

View previous topic View next topic Back to top  Message [Page 1 of 1]

Permissions in this forum:
You cannot reply to topics in this forum