30-09-2020, 04:57 PM
(This post was last modified: 30-09-2020, 05:07 PM by John Cornforth.)
Hi
Internally there is a coil from B to T and another from T to ground. Both are about 25 ohms so those measured resistances sound about right. The supply goes to B (Battery), the sender to T (Tank) and Ground to the body of the gauge. it is not polarity conscious but needs 6V not 12V.
Are you certain that the tank sender is working OK ? The tank sender will vary from a few ohms to about 30 ohms, but some are max resistance when full and others are max resistance when empty. If the sender and gauge are mismatched you will get a backwards reading.
To simulate a sender unit, apply an open and then a short circuit between T and ground, you should see the gauge move. Connecting a resistor will give an intermediate reading for example 15 ohms will give about a half tank reading. Small resistors used to be available from Maplin, but these days you need to go online.
Oh, and to answer your question, yes you can dismantle the gauge but I strongly advise against it unless you are absolutely certain that it is faulty and you have the means to remove and rewind fine wire coils and then recalibrate it !
Internally there is a coil from B to T and another from T to ground. Both are about 25 ohms so those measured resistances sound about right. The supply goes to B (Battery), the sender to T (Tank) and Ground to the body of the gauge. it is not polarity conscious but needs 6V not 12V.
Are you certain that the tank sender is working OK ? The tank sender will vary from a few ohms to about 30 ohms, but some are max resistance when full and others are max resistance when empty. If the sender and gauge are mismatched you will get a backwards reading.
To simulate a sender unit, apply an open and then a short circuit between T and ground, you should see the gauge move. Connecting a resistor will give an intermediate reading for example 15 ohms will give about a half tank reading. Small resistors used to be available from Maplin, but these days you need to go online.
Oh, and to answer your question, yes you can dismantle the gauge but I strongly advise against it unless you are absolutely certain that it is faulty and you have the means to remove and rewind fine wire coils and then recalibrate it !