Question about 1981 BMW R 65 LS

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I have a 1981 r65 bmw. My alternator light doesnt come on anymore and the battery is losing votage. Can you narrow it down to what the problem is?

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It could be the bulb in the speedow head, if its blowen it woun let power into the charger check this bulb first, then check the fuses if a fuse has blown no charge to the battery

Posted on Nov 21, 2009

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1 Answer

Bmw 2005 116i doesnt start and even the dashboard doesnt light up when key is inserted


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1976 bmw 530i car losing power, back fireing lights dim


Check battery voltage as well as alternator voltage.

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BMW with flat battery y battery flat


Have the charging system checked. To check jump start the engine and measure voltage acress battery terminals, it should be about 13 to 13.8 volts or so. If this is okay you need a new battery. If the votage readings are 12 volts are lower you probably need a new alternator.

Sep 20, 2012 | Cars & Trucks

1 Answer

R1100RT starts ok when leaving the house. After bike warms up and you kill the engine, starter drags or does not start at all.


Hi Billy, in order to check out any main system electrical circuit, you have to start with a fully charged battery 12.5 volts or better, and be able to pass a load test if necessary.
1. Check battery terminals for damage or corrosion, check battery cables at "BOTH" ends for loose, corroded, or broken connectors, "INSIDE" and outside the cable harness, perform connector wiggle test and check cables with an ohmmeter if necessary.
2. Check the voltage drop at the battery when you hit the starter button, anything below 9 volts you might have a faulty battery.
3. Check voltage at the battery with the bike running at 3,600 RPM should be 14.3 to 14.7 volts. If you are not getting these numbers, you might have a faulty voltage regulator.
4. Make sure voltage regulator is grounded and functioning properly, watch the video below on how to test a voltage regulator.
5. Unplug the connector to the alternator and hook your multimeter leads to the alternator (pin/socket selection does not matter) set the multimeter to AC volts, at an idle the meter should read 16 to 20 volts AC. at 2,000 RPM 32 to 40 AC volts, 3,000 RPM 48 to 60 AC volts. If you are not getting these numbers, you may have a faulty rotor, follow step 6
6. Set the multimeter to OHM'S, connect one lead to the alternator (any pin/socket) and the other to a ground, the meter should read infinity. Connect both leads to the alternator meter should read 0.1 to 0.2 OHM'S. If you are not getting these numbers, you have a bad stator.
7. Check all wiring in the charging circuit for worn or chaffed spots and all wiring connectors in the circuit for corroded, broken, or loose pins/sockets, which is the # 1 offender.
For more information about your issue please visit the websites below. Good luck and have a nice day.
1982 BMW R65 Charging System Diagnostics Part 1
1982 BMW R65 Charging System Diagnostics Part 2
1993 2000 BMW R1100RT R1100RS Service Manual Moto Data Project
http://www.ketchum.org/BMWmc/R1100.pdf
Hints and advice for BMW bike motorcycle owners K1 K75 K100 K1100 bulb...

Nov 01, 2011 | 1999 BMW R 1100 RT (ABS)

1 Answer

My BMW R100RS charge light comes on dimly what could be the problem. thanks Danie


Hi, Danie_naude in order to check out any main system electrical circuit, you have to start with a fully charged battery 12.5 volts or better, and be able to pass a load test if necessary.
1. Check battery terminals for damage or corrosion, check battery cables at "BOTH" ends for loose, corroded, or broken connectors, "INSIDE" and outside the cable harness, perform connector wiggle test and check cables with an ohmmeter if necessary.
2. Check the voltage drop at the battery when you hit the starter button, anything below 9 volts you might have a faulty battery.
3. Check voltage at the battery with the bike running at 3,600 RPM should be 14.3 to 14.7 volts. If you are not getting these numbers, you might have a faulty voltage regulator.
4. Make sure voltage regulator is grounded and functioning properly, watch the video below on how to test a voltage regulator.
5. Unplug the connector to the alternator and hook your multimeter leads to the alternator (pin/socket selection does not matter) set the multimeter to AC volts, at an idle the meter should read 16 to 20 volts AC. at 2,000 RPM 32 to 40 AC volts, 3,000 RPM 48 to 60 AC volts. If you are not getting these numbers, you may have a faulty rotor, follow step 6
6. Set the multimeter to OHM'S, connect one lead to the alternator (any pin/socket) and the other to a ground, the meter should read infinity. Connect both leads to the alternator meter should read 0.1 to 0.2 OHM'S. If you are not getting these numbers, you have a bad stator.
7. Check all wiring in the charging circuit for worn or chaffed spots and all wiring connectors in the circuit for corroded, broken, or loose pins/sockets, which is the # 1 offender.
For more information about your issue please visit the websites below. Good luck and have a nice day.
BMW Airhead Motorcycle Alternator Repair
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1970 1993 Bmw 2 valve Twins R45 R50 R60 R65 R75 R80 R90 R100 Motorcycle...
BMW Motorcycle Parts Fiche OEM BMW Motorcycle Parts online 1970 present BMW
http://www.bmw-motorrad.com/us/en/index.html?content=http://www.bmw-motorrad.com/us/en/services/manuals/manuals_main.html¬rack=1

Jun 13, 2011 | 1986 BMW R 100 RS

1 Answer

1976 r750/6 The bike loses all electrical power. from 1 - 24 hours later it comes back.


Hi, Larsandjudy and the usual suspects are:
1. Ignition Switch not in the "ON" position.
2. Engine Run Switch in the "OFF" position.
3. Discharged battery, check battery terminals for damage or corrosion, check the battery cables at "BOTH" ends for loose, corroded, or broken connectors, "INSIDE" and outside the cable harness, perform connector wiggle test and check cables with an ohmmeter if necessary.
4. Bank angle sensor tripped and ignition/light key switch not cycled to the "OFF" position and then back to the "ON" position.
5. Security alarm needs a reset.
6. Starter control circuit, relay, or solenoid faulty.
7. Faulty starter button.
8. Electric starter shaft pinion gear is not engaging or over-running starter clutch slipping.
For more information about your issue, please visit the websites below. Good luck and have nice a day.
Thread Bike just loses all electrical power WHILE driving
No power at all GL1200 Information Questions goldwingdocs com 1970 1993 Bmw 2 valve Twins R45 R50 R60 R65 R75 R80 R90 R100 Motorcycle...
BMW Motorcycle Parts Fiche OEM BMW Motorcycle Parts online 1970 present BMW
http://www.bmw-motorrad.com/us/en/index.html?content=http://www.bmw-motorrad.com/us/en/services/manuals/manuals_main.html¬rack=1

May 27, 2011 | 1976 BMW R 75-7

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