No running lights or wipers or turn signals or heater fan blower on 2000 beetle

get an auto electrician to check the wiring

Yes, it is called "load reduction relay" or "X contact" relay. That sounds like your problem.

Could be the key switch. Have you checked for power and ground at the blower motor and the fan switch ?

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fan motor,fuse or fan ressistor.hope this helps

1-heated washer nozzle, heated outside mirrors 10A 2-turn signal system 3-illumination 4-license plate light 5-comfort system 6-central locking 7-buck-up lights 8-telephone system 9-abs 10-engine control-gasoline 11-instrument cluster, shiftlock 12-B+ for DLC 13-brake lights 14-interior lights w/ central locking 15-instrument cluster,automatic transmission 16-a/c clutch, electrical water pump 17- door lock heater 18-right head light , high beam 19-left headlight ,high beam 20-right headlight ,low beam 21-left headlight low beam 22-sidemarker light, right 23-sidemarker light left 24- wiper system, washer pump 25-fresh air blower, air conditioning 26-rear window defogger 27- daytime running lghts 28-fue pump 29-engine control, gasoline/desel 30-sunroof 31-automatic transmission 32-injectors 33-headlight washer 34- engine control 35-trailer socket 36- foglights 37-radiosystem 38-luggage compartment lights, central locking system 39-emergency flasher 40-dual horn 41-cigaritte lighter 42- radio system 43- engine control 44-heated seats

You need a voltmeter and must troubleshoot the problem by testing for voltage from the fuse block to the components that don't work

left to right...
1. empty
2. e flashers
3.horn, brake lights
4.clock, trunk light, inside light, radio
5. rad. cooling fan relay (AC only)
6. right side running lights
7. left side running lights
8. right high beam and indicator
9. left high beam and indicator
10. right low beam
11. left low beam
12. reverse,turn signal and inst panel
13. main and transfer fuel pumps, auxiliary air reg., ox sensor heater
14. license plate and glove box light
15. wipers
16. rear defogger
17. heater blower (no AC)
18. cig lighter
19. rad cooling fan (no AC)
20. Heater blower (AC)
21. rad cooling fan (AC only)
22. empty
23. Ox sensor, idle stabilizer,seat belt warning relay, (Digifant only, control unit, idle boost control, idle boost valve)
24. inst panel lights, heater control lights
25. reading lamps
26. empty
27. empty
28. empty

Hope this helps...;-)

Reversing polarity at the battery is a very bad thing and can cause a host of unpredictable problems. You are lucky that you didn't fry the alternator diodes (the battery is charging, I hope). Each of the problems you describe will have to be treated separately. 1. try replacing the turn signal fuse and flasher unit. 2. fuel gauge has a delicate resistor... probably the easiest fix is to replace the instrument cluster. 3. Heater blower fan has a resistor pack for different fan speeds, this may be replaceable, otherwise a new blower assembly may be the best way to fix it. Hope this helps