BMW K bikes (Bricks)

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flyinglow

flyinglow
Silver member
Silver member
I have a 1985 K100 RT with 35,000 miles that I purchased a year ago. I have added voltage and coolant temperature meters to the fairing so I can monitor these items while riding. My voltmeter reads a good 13.5 to 14 volts when driving. But, as the engine gets warmed up, especially on hot days, the voltage slowly goes down to about 12. 5 to 13 volts. I have a new battery and cleaned all the ground connections. The brushes look good so my guess is to replace the regulator with a new one.

    

duck

duck
Life time member
Life time member
It might not be the voltage but the gauge being impacted by heat. Try running a digital voltmeter in tandem with the gauge to see what that shows before spending money on parts.

(PS: Your dash pad with ignition and other switches is upside down.)


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Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
94 K1100RS
93 K1100LT (x2)
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
http://www.ClassicKBikes.com
    

Dai

Dai
Life time member
Life time member
It quite probably is the regulator. That alternator has suffered a severe short at some time in its history (the red cable shows overheating). I'd replace all of the battery cables, including the earth lead.


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'83 K100 upgraded to K100RS spec
Others...
'78 Moto Guzzi 850-T3, '79 Moto Guzzi 850-T3 California,'93 Moto Guzzi 1100ie California,
'03 Suzuki Blandit GSF600SK3 (NFS any more because wifey has claimed it)
    

4Back to top Go down    Dead Short on Wed Feb 13, 2019 12:57 pm

flyinglow

flyinglow
Silver member
Silver member
Yes, I saw the melted wires and did replace all the power and ground wires. Thanks.

    

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