24 V fuel guage?

robertglines1 · 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

bevans6 · September 30, 2013, 04:56:12 AM

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

Brian

Len Silva · 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.

belfert · 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.

luvrbus · 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

robertglines1 · 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

belfert · 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.

luvrbus · 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