Question about 1981 BMW R 45

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Nothing functioning in electrical circuit except parking lights.

Initially, main switch fitted. Subsequently, loss of start button power, and warning lights from rev counter . After checking with voltmeter, finally loss of headlights and horn and iindicators. I noticed that previous owner had fitted heated grips. Seemed to work on RH side only. I would be happy to remove the wiring if it helped!! Also I noticed a click from below the saddle when operating the clutch lever.
Yours in desperation. Ray Pool. Thanks fellas.

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  • BMW Master
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Posted on Jan 02, 2017

DickCanFixIt
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SOURCE: bmw r 1100rt 1998

Check the battery with a voltmeter. If it drops below 11v while the key is on or you are trying to start it the battery is faulty. You can also try connecting jumper cables (I would do so without the donor vehicle running), if the instruments & lights work while cables are connected your battery is the problem.

Posted on Mar 01, 2009

miket756
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SOURCE: BMW R100RT Just installed new battery. Bike was

try recharging the batery first then check charging system i think its not charging the battery or the battery is a dud one

Posted on Mar 09, 2010

  • 738 Answers

SOURCE: It's been -20 for days but was warmer today.

hi, this sounds like a discharged battery, however to ilimenate the starter solenoide bridge the 2 thick wires with some insulated pliers, you will get quite a large spark when you do this but this is normal , if the engine turns over this will prove there is suficiant charge in the battery, you dont need the ignition turned on to do this however the engine wont start unless it is, without the key on you will have no other drain on the battery, so it would be most interesting if you tried it first without the ignition on ,

Posted on Jan 02, 2011

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Hope this helps ( if so please mark as very helpful)
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