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purpose of "copper winding" at fuel gauge vibrator?
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Charlo
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PostPosted: Fri Sep 11, 2020 6:56 pm    Post subject: purpose of "copper winding" at fuel gauge vibrator? Reply with quote

This "copper winding" attachment (in rubber sheath) on the fuel gauge vibrator, is on my '69 Bug. Any one have a clue as to it's purpose?
I've haven't seen this sort of attachment before ...

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Blue69Baja
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PostPosted: Sat Sep 12, 2020 10:15 am    Post subject: Re: purpose of "copper winding" at fuel gauge vibrator? Reply with quote

It is for radio interference. The OEM vibrator turns on and off thus some will radiate RF interference. Inside of the rubber insulation there is a wire that wound making a coil/choke. AM radio really picks the RF noise quite well on some frequencies.

My 72 Super had one...

Jim
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Blue69Baja
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PostPosted: Sat Sep 12, 2020 10:22 am    Post subject: Re: purpose of "copper winding" at fuel gauge vibrator? Reply with quote

A bit of trivia... The factory had to calibrate each vibrator for a voltage duty cycle. The switching on and off the provide an average of about 5 vdc for the gauge and sender to work properly.

Later the Vibrator was discontinued and the factory designed a REGULATOR using a Zener diode and a load resistor. Aftermarket replacements are not vibrators they are regulators.

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Jim
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Charlo
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PostPosted: Sat Sep 12, 2020 11:15 am    Post subject: Re: purpose of "copper winding" at fuel gauge vibrator? Reply with quote

OK! Got it!
Thank you both for educating me, and for the trivia!
TheSamba rocks!
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vwoldbug
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PostPosted: Sat Sep 12, 2020 11:39 am    Post subject: Re: purpose of "copper winding" at fuel gauge vibrator? Reply with quote

Thanks Blue69Baja
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Floating VW
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PostPosted: Sun Sep 13, 2020 5:29 pm    Post subject: Re: purpose of "copper winding" at fuel gauge vibrator? Reply with quote

This is what the inside of that vibrator looks like, in case you really wanted to know:

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glutamodo Premium Member
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PostPosted: Mon Sep 14, 2020 5:46 am    Post subject: Re: purpose of "copper winding" at fuel gauge vibrator? Reply with quote

VW introduced the Zener diode style fuel gauge regulator I think in the early 70s, but it was another radio noise reduction thing, the electromechanical vibrator could introduce a lot of noise in to the electrical system which got picked up by the radio. However the Zener wasn't really seen much at that time, the vibrator was the stock application.

Anyway, the noise reduction choke on the vibrator lead, you can see those in numerous radio installation sheets, an excerpt of one:

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Charlo
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PostPosted: Tue Sep 15, 2020 10:06 pm    Post subject: Re: purpose of "copper winding" at fuel gauge vibrator? Reply with quote

All such great input and info...
thanks again all!!
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