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83 EA81 fuel gauge..no power to sender!
Posted 26 January 2013 - 04:38 PM
So at this point, I'm wondering why I'm not getting any power from the instrument panel.
Also noticed the voltage gauge is reading obserdly low on the dash, but my sunpro gague reads around 14. This just started yesterday with the fuel gauge going out.
Am I not getting ENOUGH power to that area of the Inst. panel?
Posted 27 January 2013 - 12:07 AM
That wiring only carry Ground Signal... and trying to put Power (12V+) to the Float sender could be Very Dangerous! ... ... Imagine a Spark inside the Gas Tank...
So, if your No Reading / Low Reading fuel Gauge issue, started along the Voltage Gauge reading Low, your Subie's only electrical problem is the Alternator: It isn't Charging the Battery anymore...
Posted 27 January 2013 - 10:19 AM
If i understand correctly 12 volts should be supllyed to the fuel gauge, that 13 volts is passed through the gauge and down to the sending unit, the sending unit is also grounded. The gauge will measure resistence in the sending unit, created by the float and distance from the metal band that completes the circuit.
Are you sure there is no power going to the sending unit?
Are you saying that this is nothing more than a ground circuit, composed of a ground passing through the gauge, and down to the sending unit?
Posted 27 January 2013 - 02:38 PM
The stock voltages gauges often read low. They simply aren't very accurate. You can't rely on that reading - you need to measure voltage to the instrument panel with a meter.
Posted 27 January 2013 - 04:14 PM
Bad dash power supply or possibly ground is causing the low voltmeter readings.
Sender wire should be 12 volts unplugged.
7 volts w/a 7 ohm resistor subbed for the sender.(full tank reading)
Posted 27 January 2013 - 11:11 PM
Edited by Loyale 2.7 Turbo, 27 January 2013 - 11:22 PM.
Posted 27 January 2013 - 11:13 PM
... Are you sure there is no power going to the sending unit? ...
GD Did explained it Better than I:
You can't expect 12v at the sending unit because there is voltage drop across the gauge. Due to that you can't test for voltage at the sending unit because your test would be meaningless. You have to pull the sending unit out and test for resistance as you move it through it's range. ...
... Are you saying that this is nothing more than a ground circuit, composed of a ground passing through the gauge, and down to the sending unit?
No, what I tried to explain is that the Power (12V +) Imput to the Circuit of the Fuel Gauge is Directly supplied to the Fuel Gauge "Needle" Coil at the Instrument Cluster, while the Ground (12V -) for the Circuit is supplied by the Sender unit's Float, at the Fuel Tank.
The Position of the Sender Unit's Float, Determines the Amount of Ground on the Circuit, which makes the Needle to point Low at Low Ground = Low Float Level on the sender, or the Needle will point High at High Ground = High float Level.
Sometimes a Bad Alternator makes all the Gauges to Read Low...
Edited by Loyale 2.7 Turbo, 27 January 2013 - 11:23 PM.
Posted 28 March 2013 - 11:32 AM
Posted 28 March 2013 - 11:47 AM
So I am playing around with a similar problem. Though my sending unit was rusted solid cause the car was sitting for a while. When jump the circuit It should make the tank read full correct? I am presuming when I install the new sending unit it will still not work. If this happens what next?
If you connect the sending wire that goes to the sender to ground it should peg the gauge.
Posted 03 April 2013 - 11:20 PM
Got it by connecting all the dots... Above I grounded the gauge and it pegged. Installed the new gauge and was jumping up and down that I did not waste 85$
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