BMW Charging problem

[ToGGoT]

Hi guys, posting on behalf of my brother as i'm a little more technically minded than he is.

He's got a 1993 BMW R100GS.


A while ago the alt rotor popped, and we handed it to a local bike shop to sort out. They changed it for a new one, changed the brushes, and cleaned the loom plugs.

Since then, once you have ridden it for a few miles, the charge light starts to flicker on and off. Usually after you really open the bike up to 5k rpm upwards. From then on, it comes on more and more frequently until eventually the lights dim as the light flickers, and today it just died as he popped it into neutral.

Its been back to the garage several times (Each time they charged us mearly £40 for the privellage of saying "Cant find anything wrong mate", or "We cant get it to do it"). They eventually, after i did some research agreed that it was likely the voltage regulator, so i bought an upgraded version, and fitted it today - with altogether no luck.


So now, feeling that the garage is both useless, and trying to make more money out of us are stuck for what to do.

In my mind, it can only be either the Rotor, Regulator, or Diode Board... Only the bike didnt have this problem (Only loads of others...lol) before the rotor popped. Since its been changed this has been the norm.

Anybody got any ideas? I havent had a chance to check the voltages when the bike has been playing up, though when you start the bike from cold, the alternator IS charging the battery to 13.7v on the new regulator.

ToGGoT
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2005 BMW R1150R

[tatters]

The the whole charging system is a crap on pre-95 BMW,s a failed rotor could of also damaged the diode board and regulator.


l,ve fitted one of theses on mine for peace of mind plus it got a far larger output.


https://www.euromotoelectrics.com/product_p/edl450-altkit.htm
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Past:NRG50,AF1125(x2),NSR125RR,ZZR250,CX500,VFR400,KR1S,ZZR600(x2),CB400N,YZF1000(x2),KH125,Z200,FX400R,CBR954RR(x2)GPZ500S,GT550,VFR750F(x2),RD350N,XR650R,CBR600F,CB250,KDX250,YZF750R,CRM250,400EXC,KLR650,TTR600RE,DR350S,R100GSPD,RGV250,VMAX1200,DL650,KZ750 Present:G650XC,C12,CRF450X,1190ADV