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I have seen the high beams burn out; it is common. You could test the bulbs and if they are ok; then see if the plug is getting power in the high beam mode with a circuit tester. I would also; make sure you have the correct bulbs installed, goofier things have happened. As you noted; the stalks fail but I would test/check the bulbs first.

Headlight Bulb High Beam: part # H1

The wiring have been known to fail and bad connections, can burn out bulbs faster too.

Cleaning them with some contact cleaner and using dielectric grease is supposed to help. Both of these are available at most auto parts stores:

CRC 5103 Quick Dry Electronic Cleaner - 11 Wt Oz.

https://www.google.com/search?q=CRC...rome..69i57&sourceid=chrome&es_sm=91&ie=UTF-8

Permatex 22058 Dielectric Tune-Up Grease, 3 oz. Tube

https://www.google.com/search?q=Per...rome..69i57&sourceid=chrome&es_sm=91&ie=UTF-8

The headlight harnesses; have also, been known to crack and melt. These guys sell the stock and upgraded harnesses; the upgraded version is cheaper than the stock, failure prone version.

http://www.fixmyvw.com/upgraded-wiring-vw-beetle-headlight-harness/
 

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Yeah, that is odd; until you test the bulbs and check for power with a circuit tester, you won't know what going on. If the bulbs are good; there is no power at the plug and fuses are good, it would seem to point to the stalk. I have had the high beams not work before; in those cases, it was the bulbs were bad. Hopefully, that is the situation with your car; cleaning the plugs and using dielectric grease, hopefully will help them last longer.
 
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