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Charlo Samba Member
Joined: March 19, 2015 Posts: 50 Location: Southwest Oregon
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Posted: Fri Sep 11, 2020 6:56 pm Post subject: purpose of "copper winding" at fuel gauge vibrator? |
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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 ...
_________________ 1969 Type 1171 Sunroof Sedan |
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Blue69Baja Samba Member
Joined: September 04, 2008 Posts: 1065 Location: Fair Oaks
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Posted: Sat Sep 12, 2020 10:15 am Post subject: Re: purpose of "copper winding" at fuel gauge vibrator? |
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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 _________________ 69 Baja with a 1914...
72 Super 100% orig...W/ factory air... 56,000mi
Even the spare is original.. |
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Blue69Baja Samba Member
Joined: September 04, 2008 Posts: 1065 Location: Fair Oaks
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Posted: Sat Sep 12, 2020 10:22 am Post subject: Re: purpose of "copper winding" at fuel gauge vibrator? |
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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.
Jim _________________ 69 Baja with a 1914...
72 Super 100% orig...W/ factory air... 56,000mi
Even the spare is original.. |
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Charlo Samba Member
Joined: March 19, 2015 Posts: 50 Location: Southwest Oregon
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Posted: Sat Sep 12, 2020 11:15 am Post subject: Re: purpose of "copper winding" at fuel gauge vibrator? |
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OK! Got it!
Thank you both for educating me, and for the trivia!
TheSamba rocks! _________________ 1969 Type 1171 Sunroof Sedan |
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vwoldbug Samba Member
Joined: January 28, 2009 Posts: 1214 Location: Ohio
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Posted: Sat Sep 12, 2020 11:39 am Post subject: Re: purpose of "copper winding" at fuel gauge vibrator? |
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Thanks Blue69Baja |
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Floating VW Samba Member
Joined: April 28, 2015 Posts: 1596 Location: The South Zone
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Posted: Sun Sep 13, 2020 5:29 pm Post subject: Re: purpose of "copper winding" at fuel gauge vibrator? |
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This is what the inside of that vibrator looks like, in case you really wanted to know:
_________________ "It's time you started treating people as individuals, rather than mathematically predictable members of an aggregate set, regardless of how well that works." |
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glutamodo The Android
Joined: July 13, 2004 Posts: 26298 Location: Douglas, WY
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Posted: Mon Sep 14, 2020 5:46 am Post subject: Re: purpose of "copper winding" at fuel gauge vibrator? |
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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:
_________________ Andy T.
IMAGE NOTE: It has been noted that Chrome based browsers may have issues in displaying my vast image library, which use non-secure links and are on an FTP server. Images should still be viewable if the link is clicked though.
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Charlo Samba Member
Joined: March 19, 2015 Posts: 50 Location: Southwest Oregon
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Posted: Tue Sep 15, 2020 10:06 pm Post subject: Re: purpose of "copper winding" at fuel gauge vibrator? |
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All such great input and info...
thanks again all!! _________________ 1969 Type 1171 Sunroof Sedan |
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