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Author Topic: 24 V fuel guage?  (Read 566 times)
robertglines1
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« on: September 29, 2013, 05:39:41 PM »

Will a 24 v fuel gauge read on a 12 volt  feed? I guess what I'm asking does it measure resistance so would it measure half full?  I'm changing from 24 V system to 12 volt and fuel gauge is 24 volt I'm hoping I just need to change it and not sending unit in tank.  Any comments??   Bob--------    Explanation:: other than a few gauges I find myself no longer in need of the 24 volt side of the system. I no longer have the big 24 volt ac system or 24 volt starter, defroster motors or windshield wiper motors.  All lights are 12 volt.  I could retain the 24volt system or just replace a few items and simplify everything by making all 12 volt.   Bob
« Last Edit: September 30, 2013, 04:17:12 AM by robertglines1 » Logged

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bevans6
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« Reply #1 on: September 30, 2013, 04:56:12 AM »

You could get an inexpensive 12V to 24V converter to run gauges, if you needed to.

Brian
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Len Silva
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« Reply #2 on: September 30, 2013, 05:10:36 AM »

You will have to know the resistance range of the sender, then you can replace just the gauge.
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« Reply #3 on: September 30, 2013, 05:35:09 AM »

Most of my 24 volt gauges just have a resistor on the back that drops voltage to 12 volt.  A fuel sender is simply a variable resistor in most cases and doesn't care about voltage.  If you do what Len says and get a 12 volt gauge you should be fine as long as you rewire everything to 12 volt.
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Brian Elfert - 1995 Dina Viaggio 1000 Series 60/B500 - 75% done but usable - Minneapolis, MN
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« Reply #4 on: September 30, 2013, 05:42:57 AM »

Most 24 volt fuel gauges are 33 to 240 ohms the 12 volt fuel gauges seem to be 0-90 ohms
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robertglines1
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« Reply #5 on: September 30, 2013, 05:46:40 AM »

I'm following both post and checking as we go in bus.  Makes sense .  Nice to be at this point of catching up on details and having help!  I can actually think of a start up soon.  2years has past.  from a salvage shell with no drive train.   What will I do when it's done??  House Work--         So just caught  LB post-- need to think a little more.   Bob
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« Reply #6 on: September 30, 2013, 05:53:59 AM »

One can purchase 12 or 24 volt fuel gauges in just about any resistance range one wants.  Some may not be as readily available as others.
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Brian Elfert - 1995 Dina Viaggio 1000 Series 60/B500 - 75% done but usable - Minneapolis, MN
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« Reply #7 on: September 30, 2013, 07:24:24 AM »

There is no need for Bob to buy a gauge or a sender for fuel he can take a pencil and wrap the wire around the pencil to set the resistance ohms just about all buses use 12volt gauges through a shunt and resistors

I gave the ohms from a 24v Prevost and a 12 volt Eagle he can make it work without buying anything except the light blub which I know he can 

All the modern gauges and lights on the dash are controlled by a little black box mounted on the frame it could care less you set that with a laptop 

That is were people get into trouble buying dash gauges from a truck from 2000 on they don't work without the little box
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