Abs lights on my 1995 bmw r1100rs will not stop blinking

code p 0500 and 503 both refer to the vehicle speed sensor(VSS)---circuit malfunction or intermittent/ errattic high input====causes wiring-=--VSS---ECM--wiring poor connection--other connected system---instrument panel---VSS---communication control module
to have the abs light on I would be checking the communication control module or the ECM

Get a diagnostic code reader. Read more about them here:
http://www.bimmerforums.com/forum/showthread.php?1790673-cheap-code-reader-bmw-e39

Look up codes here:
http://www.obd-codes.com/trouble_codes/bmw/

Shell Advance AX7 4T 10W-40 Lubricant for 4 stroke motorcycle engineSemi-Synthetic

http://www.ebay.ie/itm/BMW-R1100RS-ABS-93-01-Shell-Advance-AX7-4T-10w40-Oil-Filter-Kit-HF163-/170970019967

Hope this helps your out. I know the diagram and locator is a bit blurry but hopefully it gets what you need.
Drivers kick panel:
Front wiper 20A - Front wiper system Cigar 15A- Cigarette lighter Audio 10A- Audio, remote control mirror Air Bag 10A -Air bag diagnostics Stop lights- 15A -Rear brake light, high mounted stop light ECU B+ 10A - Shift lock actuator, transaxle controle module, radio, engine control module Room 10A - Interior light, clock, ignition key reminder, rear cargo area light switch ABS 10A- Anti lock brake system control unit ECU IG1 10A - Transaxle control module, shift lock actuator, ABS control unit, DRL unit Meter 10A - Instrument panel, back-up switch, electronics time control module, inhibit switch Turn signal 10A- Hazard switch ,front and rear turn lights, turn indicator IGN1 20A - Ignition switch ABS 30A- ABS pump motor TNS 30A- Tail light, license plate light COOL/FAN 30A- Cooling fan Cond/Fan 20A- A/C condenser fan Starter 15A- Start signal , Fuel pump Blower 25A- Blower Motor SR/ACC 10A - Ignition switch Hazard 15A - Hazard and turn signal light D/Lock 25A- Door locks ABS 30A - Anti lock brake system control P/W RH 20A- Power window motor right hand P/W LH 20A- Power window motor left hand IGN2 25A- Ignition Switch
Engine compartment :
Head 25A- headlights IG 2 30A- Ignition switch IG coil 15A -Ignition coil, condenser,generator IC regulator, diagnostic connector. O2 down 10A- Rear O2 sensor O2 up 10A- Front O2 sensor Fuel pump 10A -Fuel pump unit Injector 10A -Fuel injector ,camshaft positioning sensor, purge solenoid valve, EVAP, IAC actuator, Mass Airflow sensor, EGR stepper motor. fuel pump relay coil, vehicle speed sensor. A/Con 10A - A/C compressor controls, cooling fan BTN 30A- Brake light , high mounted stop light. Tail light LH 10A- License plate light, tail light , rear combo light, instrument panel illumination Tail light RH 10A-License plate light, tail light , rear combo light, instrument panel illumination Head low 15A- Headlight Head Hi 15A-Headlight Horn 15A- Horn

Inside kick panel

I'd have the brake accumulator checked. Try this. From a cold start, e.g., an overnight stop, release the handbrake (as it also operates the dash berake light), start the engine, and time how long it takes for the brake light on the instrument panel to go out. If it's up near 45 seconds, your accumulator is probably on the way out. They do fail after some years.

Locate the blue ABS 3 pin connector underneath the side cover, attach a piece of wire to the MIDDLE pin and other end to good ground such as motor mount bolt. Turn on the ign switch, press front and rear brake levers to extinguish the red bulb checker light in middle of your instruments, ABS lights should start flashing indicating reset mode, now press the ABS reset rocker switch on the handlebar pad and hold for slow count or 10. Release , turn off ignition, remove wire and try it! I have reset units that the dealers said were bad using this method. It unlocks the Cmos chips in the module.

it is caused by low battery voltage run bike for about a mile then stop turn of turn back on wait till abs lights go out then start