Temp & Fuel gauge
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  1. #1
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    Temp & Fuel gauge

    Hi can anybody give me any ideas why these dont work,its on my 1955 F250,i presume these are 6 volt gauges and the vehicle has been converted to 12 volt,the fuel gauge goes over to full as soon as you conect the sender,and the temp,when there is no power on at all ie battery off altogether this goes to the hot position and when the ignition is on goes to the cold and doesn't move,
    any ideas please,
    Chris.

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    Re: Temp & Fuel gauge

    Was the truck positive earth originally, and what is it now?

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    Re: Temp & Fuel gauge

    Im guessing it would have been positive earth,its now negative,it was rewired when i got it,the temp gauge has a resistor in it but the fuel doesn't,presume ill have to sort that first.
    Chris.

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    Re: Temp & Fuel gauge

    dont the older cars use voltage stabilisers on the wiring to the fuel and temp gauges, perhaps you could try one of a 60s cortine or old escort

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    Re: Temp & Fuel gauge

    I am not entirely sure about the fuel gauge but when I converted my mercury the temp gauge did that exact thing if it was hooked up backwards. I believe the fuel gauge would be the same. All the gauges will need resistors. Speedway motors carries them. They are not too cheap though. Good luck.

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    Re: Temp & Fuel gauge

    Ordered a resistor from the states that should do all the clocks,let you know what happens,
    Chris.

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    Re: Temp & Fuel gauge

    I suspect that when you truck was converted to 12 volt the person doing the change out thought that 12 volt senders were needed. This is not the case.
    The only 12v senders that look and fit the same as the 6v ones are from a '56 Ford. The instruments on a '56 Ford are a one year only stand alone item, and are not compatible or interchangeable with any other years.
    Check your fuel sender. It should be mounted to the tank with six screws.(no adapter) If it is from a '56 it will have 12v stamped on the cover.
    The temp sender should look like the one pictured below (long brass bowl) but have either no voltage markings or have 6v marking. I suspect it will be as the picture, 12v marked.



    The gages are probably the original units. To check them you will need an ohm meter. They should measure around 10-12 ohms resistance across the posts. The '56 units will measure 40 ohms.
    If the parts check out as described above then the best fix is to get '55 senders and use as is. Senders can come from car or truck. The arm length on the fuel sender can be changed if the sender comes from a car tank.
    Once you have the correct parts you can run them on 12 volts with no other modifications. They are not polarity sensitive and no voltage dropping or regulating device is needed.

    The temp gage resting on H when not turned on is correct for all '55 and '56 Fords. A designers idea of an aesthetically pleasing dash.



    Once stripped of face and needle differences, all pre '56 and all post '56 gages are basically the same (10-12 ohm resistance) and are interchangeable, regardless of voltage applied, but an instrument voltage regulator will be required if later sending units, ('57 and up) are used.

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    Ok Thanks for all that info peter,my gauges read 10 ohms but my temp sender looks a littie shorter than the one above and the marks on it are worn but looks like it says 15/17 if that means anything but no voltage marked,guage still doesnt read anything,but if you earth it out it goes straight over to cold so i am assuming the gauge works ok,fuel still doesnt work either,sender has no markings on it again shorted out goes straght over to full,so question is,can i assume the senders are faulty,
    any help appreciated,starting to p**s me off now,
    Thanks for looking,
    Chris

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    First be sure that there is no voltage regulator or dropping device between the accessory side of the ignition switch and the gages. If still original I believe it will be a two tailed black wire with a green tracer.
    As I said earlier there were only two gages used in Ford cars for many years, the '56 40 ohm units, and the rest. I checked a few gages here earlier today, and most of the "rest" were closer to 14 ohm resistance and not the 10-12 that I mentioned before. That said, with the correct senders your gages should still deflect the needle.
    Since the temp moves to cold when power is applied then the switching mechanism inside the sender must be working, but not registering temp change makes me believe that you have a mismatched part.('56 sender). I have a used '55 sender I can send if you can't source one locally.
    To check the fuel level system first remove the sender from the tank. It should look like one of these.



    If not then that is the problem. If it does then first check that float arm was not stuck in full position.(most unlikely, but sometimes you just get lucky) Assuming not stuck then attach a temporary ground wire to the sender body and manually move the float arm back and forth, watching the gage for any movement. If none then pry the lid off the sender and burnish the contact points under there. Hopefully yours will be cleaner than this one.



    Cleaning the points fixes most of these senders, but if it does not work for you then it will have to be replaced. As with the temp sender I can send you one if not available locally.

  12. #10
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    Thanks for all the info Peter,The fuel sender is one like that and the float arm does move,however i have not prised the bottom off yet but ill try that this evening,i think somewhere along the lines i have mis understood you as well going on the 9.8ohm reading i got from the gauges these are 6 volt,so the stabiliser i ordered fron USA off ebay do i need this in or not,i have it in at the moment,but they dont work either with it in or out.
    Also with the temp gauge i may have misled you,it doesn't go to cold with the power on only when i touch the wire to ground,thats why i think the sender is at fault,if so what do i ask for when ordering one or do i just give the year of the vehicle?

    Once again Peter i must thank you for all your helpfull advice and for going to all the trouble for pictures as well,i'm sure between us if you have the patience with me we can sort it out,hope i can be as helpfull one day,

    Regards Chris

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