Question about 1979 Lincoln Mark V

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Need resistance wire to repair vintage Ford electric gauges

The IVR (gauge voltage regulator) failed and caused the wires inside the gauges to overheat and burn off the insulation on the wire. Need a source for some of the wire used to manufacture the gauges so we can repair them.

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Use magnet wire from an electronic supply store. Replace wire with same thickness (Gauge)and number of turns.

Posted on Apr 18, 2010

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What's your question?fuel pump working but gauge nt working wts can be the cause.


Either the gauge itself, or the wire from gauge to tank, or the sending unit in the tank. Most of the time it is a problem with the sending unit.

They work like this: in the instrument cluster, a small voltage regulator sends low voltage through the gauge, into the wire to tank, and to the sending unit. The unit has a variable resistor that varies according to the fuel level, measured by the float arm attached to the unit. What it (the gauge) actually measures is resistance to ground-the current goes to a ground point after going through the variable resistor in the sending unit.

You can check if problem is the gauge or the sending unit by grounding the fuel gauge wire at the gas tank connector. Pull the electrical connector apart and locate the fuel gauge wire. Jumper that wire to ground on the frame while watching the fuel gauge needle for movement. DO NOT ground it for more than a split second, just touch to ground while someone watches the gauge. If the gauge needle moves at all (will probably go to full or empty), then the problem is the sending unit in the tank. The gauge is good, so is the wire from gauge to tank. I should mention that doing this test can possibly blow the meter (gauges) fuse in the fuse panel- why I said to do it just for a brief moment.

Jun 29, 2015 | Cars & Trucks

1 Answer

1997 ford expedition what cause the fuse for the gauge to blow


usually grounded wire--to in tank fuel meter--coolant temp sending unit--or voltage regulator (alternator).--Check prior repairs for hint .What has been removed and or replaced recently??? Fuel pump or tank? Intake Manifold? Alternator? start looking for pinched wire and or shorted component there.

Dec 06, 2014 | Ford Cars & Trucks

1 Answer

Ford escape code p0191


Possible causes
- Low or no fuel
- High fuel pressure
- Low fuel pressure
- Faulty Rail Pressure (FRP) Sensor
- FRP harness is open or shorted
- FRP circuit poor electrical connection
- Faulty Fuel Pump
- Vacuum leaks
P0191 Ford - Fuel Rail Pressure Sensor Circuit Range/Performance P0191 Ford Description
The Fuel Rail Pressure (FRP) sensor is a diaphragm strain gauge device in which resistance changes with pressure. The electrical resistance of a strain gauge increases as pressure increases, and the resistance decreases as the pressure decreases. The varying resistance affects the voltage drop across the sensor terminals and provides electrical signal to the Powertrain Control Module (PCM) corresponding to pressure.
Strain gauge type sensors are consider passive sensors. A passive sensor is connected to a voltage divider network so that varying the resistance of the passive sensor causes a variation in total current flow.
Voltage that is dropped across a fixed resistor in series with the sensor resistor determines the voltage signal at the PCM. This voltage signal is equal to the reference voltage minus the voltage drop across the fixed resistor.
The FRP sensor measures the pressure of the fuel near the fuel injectors. This signal is used by the PCM to adjust the fuel injector pulse width and meter fuel to each combustion cylinder.

Aug 12, 2014 | 2008 Ford Escape

2 Answers

P0193 - fuel rail pressure sensor circuit high input


Possible causes- Excessive resistance in the circuit
- Low or no fuel
- Wiring harness connector of the fuel pressure sensor
- Fuel Rail Pressure Sensor
- Fuel Pump
help.png Help with thisSymptoms- Engine Light ON (or Service Engine Soon Warning Light)
- Engine will not startP0193 DescriptionThe Fuel Rail Pressure (FRP) sensor is a diaphragm strain gauge device in which resistance changes with pressure. The electrical resistance of a strain gauge increases as pressure increases, and the resistance decreases as the pressure decreases. The varying resistance affects the voltage drop across the sensor terminals and provides electrical signal to the Powertrain Control Module (PCM) corresponding to pressure.


Strain gauge type sensors are consider passive sensors. A passive sensor is connected to a voltage divider network so that varying the resistance of the passive sensor causes a variation in total current flow.


Voltage that is dropped across a fixed resistor in series with the sensor resistor determines the voltage signal at the PCM. This voltage signal is equal to the reference voltage minus the voltage drop across the fixed resistor.


The FRP sensor measures the pressure of the fuel near the fuel injectors. This signal is used by the PCM to adjust the fuel injector pulse width and meter fuel to each combustion cylinder.P0193 Information for specific makesP0193 FORD
P0193 HONDA
P0193 ISUZU
P0193 MAZDA
P0193 LEXUS
P0193 VOLKSWAGEN
Need more help?Do you need more help with the P0193 code? ask a question to all or users or search the top hand picked automotive forums for more information

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Sep 10, 2012 | 2005 Hyundai Tucson

1 Answer

Needles on my Gauges are absolutely crazy! 1996 Pontiac Grand Am SE V6


1= this happen because th IVR fail, see the diagram and test it use the DVOM OR VOM for test the IC .l
2= test the thermistor or sensor for defective.
3= if the voltage of IVR is out of regulation in this case +12vdc,test for ground.if is o.k test by the side of battery side of the IVR, if this voltage is present replace the IVR, if regulated voltage is withing specifications, test the printed circuite from the IVR to the gaues, and if there are open circuite replace the circuit board. OF course test the fuse too.
God bless you

7_14_2012_6_13_12_pm.jpg7_14_2012_6_13_55_pm.jpeg

Jul 14, 2012 | Cars & Trucks

1 Answer

Automotive code p0191


P0191: Fuel Rail Pressure Sensor CKT Range/Perf

- High fuel pressure
- Low fuel pressure
- Damaged FRP sensor
- Excessive resistance in the circuit
- Low or no fuel
- Wiring harness connector of the fuel pressure sensor
- Fuel Rail Pressure Sensor
- Fuel
- Vacuum leaks

The Fuel Rail Pressure (FRP) sensor is a diaphragm strain gauge device in which resistance changes with pressure. The electrical resistance of a strain gauge increases as pressure increases, and the resistance decreases as the pressure decreases. The varying resistance affects the voltage drop across the sensor terminals and provides electrical signal to the Powertrain Control Module (PCM) corresponding to pressure.

Strain gauge type sensors are consider passive sensors. A passive sensor is connected to a voltage divider network so that varying the resistance of the passive sensor causes a variation in total current flow.

Voltage that is dropped across a fixed resistor in series with the sensor resistor determines the voltage signal at the PCM. This voltage signal is equal to the reference voltage minus the voltage drop across the fixed resistor.

The FRP sensor measures the pressure of the fuel near the fuel injectors. This signal is used by the PCM to adjust the fuel injector pulse width and meter fuel to each combustion cylinder.

Feb 07, 2012 | 2006 Ford Mustang

1 Answer

P0193 fuel rail pressure circuit high input


P0193 - Fuel Rail Pressure Sensor Circuit High Input
The Fuel Rail Pressure (FRP) sensor is a diaphragm strain gauge device in which resistance changes with pressure. The electrical resistance of a strain gauge increases as pressure increases, and the resistance decreases as the pressure decreases. The varying resistance affects the voltage drop across the sensor terminals and provides electrical signal to the Powertrain Control Module (PCM) corresponding to pressure.

Strain gauge type sensors are consider passive sensors. A passive sensor is connected to a voltage divider network so that varying the resistance of the passive sensor causes a variation in total current flow.

Voltage that is dropped across a fixed resistor in series with the sensor resistor determines the voltage signal at the PCM. This voltage signal is equal to the reference voltage minus the voltage drop across the fixed resistor.

The FRP sensor measures the pressure of the fuel near the fuel injectors. This signal is used by the PCM to adjust the fuel injector pulse width and meter fuel to each combustion cylinder.

Symptoms:
- Engine Light ON (or Service Engine Soon Warning Light)
- Engine will not start

Possible causes
- Excessive resistance in the circuit
- Low or no fuel
- Wiring harness connector of the fuel pressure sensor
- Fuel Rail Pressure Sensor
- Fuel Pump


Hope this helps (remember to rate this answer).

Jan 12, 2011 | 2004 Ford Explorer Sport Trac

2 Answers

Gas Gauge not working all the time.


SOUND LIKE FUEL LEVEL SENDING UNIT FAULTY.

Jun 15, 2010 | 1997 Chevrolet S-10 Pickup

1 Answer

Gas gauge not working


Your sending unit is bad.

Here is the circuit:

(+)———»IS———»VR———»G———»SU———»(Gnd)

IS: Ignition Switch
VR: Gauge Voltage Regulator (mounted with the gauges)
G: Gauge
SU: Gas tank sending unit

The gauge deflects through heating a strip of metal that bends when hot. There is resistance wire wrapped around that strip to heat it up. One end of that wrap of wire is attached to the gauge "voltage regulator, the other end to the tank sending unit. The "voltage regulator" cycles between conducting power from the Ign. Sw. to the gauge, and disconnecting the gauge from that voltage. The sending unit in the tank varies resistance in response to the position of the float in the tank. Full: virtually no resistance. Empty: a lot of resistance. When the tank is full, during the period the "voltage regulator" is on, the strip of metal heats up a lot, because the sender has almost no resistance. When the tank is empty, during the period of time the "voltage regulator" provides voltage, the strip barely gets heated, deflecting the gauge hardly at all, because the resistance the sending unit creates limits the current through the gauge.

You have almost no continuity through the sending unit except near full, and at a few other position. Replace the sender, and you will have a functioning gauge.

Jun 15, 2010 | 1988 Chevrolet Monte Carlo

1 Answer

Gas guage not working


Voltage from the battery goes through the ignition switch, through a device in the instrument cluster called a voltage regulator (though it is really misnamed), through the gauge, through the wiring to the gas tank, through the sending unit in the gas tank to ground.

The sending unit is an electrical wiper that slides across a peice of resistance wire. the movement of the float moves the wiper. If the sending unit no longer makes electrical continuity, the gauge will read zero. If the sending unit wiper is shorted out, the gauge will read full.

Try grounding the wire at the tank to see if the gauge maxes out, then disconnect it to see if the gauge zeros out. If all that happens, your problem is the sending unit in the tank. If none of that happens, your problem lies closer to the front of the car. While you are under there, you should measure the resistance from the terminal on the tank to ground, just to verify that the sending unit makes some electrical contact.

If the other gauges work OK (temp, oil pressure) then the "voltage regulator" is probably working fine, and the problem is the gauge itself.

If you have no other gauges (excluding speedometer, tachometer and battery voltage meter -- they work differently), then try this:

Put a voltmeter on the part of the fuel level gauge that is supplied by the "voltage regulator." The voltage there should regularly cycle between near zero to 10 or 12, back to near zero, etc. If you get that cycling, then it is most likely the gauge.

Jun 15, 2010 | 1988 Chevrolet Monte Carlo

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