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Farmall & IHC Tractors Discussion Forum
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340 gauges

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mwilke

04-22-2018 13:16:29




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I recently bought a 340 that was converted to 12 volt alternator. is it necessary to change ammeter and electric fuel gauge?




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tjv

04-23-2018 04:58:10




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 Re: 340 gauges in reply to mwilke, 04-22-2018 13:16:29  
I do not think there should be any problem the 340 would have been 12 volt from new but would have been a generator and converting to an alternator wouldn't make Any difference for the gauges the only change made would have probably been to go from positive ground to negative ground



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Bob

04-22-2018 15:48:15




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 Re: 340 gauges in reply to mwilke, 04-22-2018 13:16:29  
Ammeters typically aren't rated for 6 or 12 volts, it doesn't matter.

Electric fuel gauges typically ARE. "old" says he has no issues running 6 Volt fuel gauges on 12 Volts, and he may be right, although I can't believe it does them any good to operate at double design voltage.

However, when I convert a 6 Volt system to 12 I install an electronic regulator to drop the voltage to the fuel gauge to 6 Volts nominal, actually more like 7 Volts.

There's dozens of "do it yourself" circuits out there to do this with a simple little integrated circuit voltage regulator, or they can be bought ready-made.

Another possible issue... if the system was originally (+) ground and has been converted to (-) ground some fuel gauges are not as accurate as before, after the conversion.

Below is ONE source from them ready-made.

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Bob

04-22-2018 17:52:32




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 Re: 340 gauges in reply to Bob, 04-22-2018 15:48:15  
Here's simple "homebrew" gauge voltage reducer...



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old

04-22-2018 13:25:05




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 Re: 340 gauges in reply to mwilke, 04-22-2018 13:16:29  
No problem with either one. Amp gauge does not car if it is 6 or 12 volts and same with the fuel gauge



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