or just fit a newer dash then youll have a working fuel gauge AND mph speedo
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| 6v fuel gauge on 12v http://www.international2cvfriends.com/forum/viewtopic.php?f=7&t=5141 |
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| Author: | samfieldhouse [ January 26th, 2014, 9:03 pm ] |
| Post subject: | 6v fuel gauge on 12v |
So i have a 6v fuel gauge I'd like to use on a 12v car. If I wire it up with one of these, will it work as prescribed? http://www.ebay.co.uk/itm/DC-DC-Converter-12V-Step-down-to-6V-3A-15W-Power-Supply-UK-SELLER-672-/350950348467?pt=UK_Computing_Other_Computing_Networking&hash=item51b64556b3 http://www.ebay.co.uk/itm/DC-DC-Converter-12V-Step-down-to-6V-3A-15W-Power-Supply-LONDON-UK-SELLER-20-/111251612694?pt=UK_Computing_Other_Computing_Networking&hash=item19e71ce416 |
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| Author: | Nelsthebass [ January 26th, 2014, 10:33 pm ] |
| Post subject: | Re: 6v fuel gauge on 12v |
Could you not wire a resistor in the feed line? |
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| Author: | samfieldhouse [ January 26th, 2014, 11:47 pm ] |
| Post subject: | Re: 6v fuel gauge on 12v |
Apparently yes but I wondered if a proper 6v fees would be more stable. |
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| Author: | ken [ January 27th, 2014, 12:26 am ] |
| Post subject: | Re: 6v fuel gauge on 12v |
A stablised 6 volt supply is the only option; a single resistor won't work because the current drawn by the gauge and sender varies with the level of fuel. samfieldhouse wrote: Apparently yes but I wondered if a proper 6v fees would be more stable. |
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| Author: | Sean [ January 27th, 2014, 9:03 am ] |
| Post subject: | Re: 6v fuel gauge on 12v |
or just fit a newer dash then youll have a working fuel gauge AND mph speedo
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| Author: | samfieldhouse [ January 27th, 2014, 11:06 am ] |
| Post subject: | Re: 6v fuel gauge on 12v |
ken wrote: A stablised 6 volt supply is the only option; a single resistor won't work because the current drawn by the gauge and sender varies with the level of fuel. Cheers for that  Sean wrote: or just fit a newer dash then youll have a working fuel gauge AND mph speedo Yeah but where's the fun in that 
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| Author: | bobh [ January 27th, 2014, 2:52 pm ] |
| Post subject: | Re: 6v fuel gauge on 12v |
When I changed my '63 AZU to 12 volt, I left fuel gauge and sender the same except for the dash lamp. Works perfectly. Note, there isn't a stabilised supply, just the alternator regulator. The only small problem I have is that the speedo reads 10 kph fast. |
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| Author: | samfieldhouse [ January 27th, 2014, 3:04 pm ] |
| Post subject: | Re: 6v fuel gauge on 12v |
There is quite some debate as to wether 6v gauges will work on 12v, the VW forums are full of it... |
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| Author: | Tripyrenees [ January 27th, 2014, 4:43 pm ] |
| Post subject: | Re: 6v fuel gauge on 12v |
Why not try it  Then there is no debate 
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| Author: | Little Louis [ January 27th, 2014, 9:20 pm ] |
| Post subject: | Re: 6v fuel gauge on 12v |
Sam, you literally just need 2 resistors to step 12V to 6V in the form of a voltage divider. So your Vin is 12V... The V out is controlled by the ratio of the two resistors.. put simply Vout = (R1/ (R1+R2))*Vin Basically to drop the voltage by half you need all the same resistor values...Using 150Ohm resistors Vout = (150/300) *12 = 6 
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