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How do i test the oil light sender unit and the temperture sender unit and wires?

1979 ford thunderbird when i turn the key to on the oil light, alt light don't come on how do i check this out?

Posted by Joe Russell on

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Rigger DeBusk

  • 1811 Answers

SOURCE: when i connect a test light to the wire at the gas tank and turn the key on do the test light suppose to come on?

First things first my friend. You must test the gage to be sure it is good. Normal procedure is: Switch off, unplug the wires from the sending unit at tank, connect jumper between the power wire and ground wire in the connector block, go to the switch and turn it to run position. If the needle goes to full, the gage is good. Turn the switch off. Now, be sure the connection is plugged in completely and you've a GOOD ground on the sending unit tab on the top of sending unit. No ground, no working needle. Use the test light to find if there's continuity with ground tab using power wire and touch the ground. No light, work with it till you do. Clean stuff to make the ground on tab work. Once test light does light between power and ground tab, your good. Gage should definitely be working now. If it doesn't work, this calls for replacing the sending unit in tank by dropping the tank first. Then it's easy to replace the sending unit.

Posted on Jul 20, 2017

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John horn

  • 37 Answers

SOURCE: how do i remove the ignition switch on a 1979 ford thunderbird?

Sounds like the circuit board behind the dash. They will short out over time. As far as ignition switch:put key in use a paper clip or equivalent to put in the small hole turn switch. Sould pull right out.

Posted on Aug 22, 2017

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1 Answer

How do i remove the ignition switch on a 1979 ford thunderbird?


Sounds like the circuit board behind the dash. They will short out over time. As far as ignition switch:put key in use a paper clip or equivalent to put in the small hole turn switch. Sould pull right out.

Aug 22, 2017 | Ford Cars & Trucks

1 Answer

The two wires that run from the sender unit at the gas tank do one of them connect to the ignition switch?


One of them should be connected to ignition feed. I don't know if you have a gage fuse in your fuse box? I won't have a wiring diagram for this model year.
One of those wires is voltage, I don't know if 12 volts? You can check it and see? If one or both wires have too much resistance, it can cause a problem. I can't rule out the fuel gage itself.

Aug 07, 2017 | Ford Cars & Trucks

1 Answer

When i connect a test light to the wire at the gas tank and turn the key on do the test light suppose to come on?


First things first my friend. You must test the gage to be sure it is good. Normal procedure is: Switch off, unplug the wires from the sending unit at tank, connect jumper between the power wire and ground wire in the connector block, go to the switch and turn it to run position. If the needle goes to full, the gage is good. Turn the switch off. Now, be sure the connection is plugged in completely and you've a GOOD ground on the sending unit tab on the top of sending unit. No ground, no working needle. Use the test light to find if there's continuity with ground tab using power wire and touch the ground. No light, work with it till you do. Clean stuff to make the ground on tab work. Once test light does light between power and ground tab, your good. Gage should definitely be working now. If it doesn't work, this calls for replacing the sending unit in tank by dropping the tank first. Then it's easy to replace the sending unit.

Jul 20, 2017 | Ford Cars & Trucks

1 Answer

How do I fix the temperture gauge on 2004 Ford Explorer V-8


There can be moisture and corrosion on connector to sending unit. There can be sediment on head of sender inside engine. You could have a mouse problems, they are known to eat wiring.

Jan 09, 2015 | Ford Cars & Trucks

2 Answers

Fuel gauge alwaya read full


The wire between the dash and the fuel tank is connected to ground somewhere. there is a control that fails too but if the control failed the temperture gauge also won't work. The wire can get in troble inside the tank too as if someone tried to steal the gas with a hose. if you can disconnect the connector ( wireing ) at the fuel tank and turn the key on and the gauge goes to empty you know the troble is inside the tank and the pump sender unit will need to be removed from the tank to correct the problem or even the gauge unit replaced.70198425.jpg

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How to fix a fuel gage on a 72 ford thunderbird


Perhaps you might consider the sending unit in the gas tank.

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Have a 1979 firebird need to know what color the oil sending unit wire is, also the temp sending unit wire


you can find wiring diagrams on the autozone.com site. become a member and log in.

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1979 ford pickup 460ci backfired now nospark


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Oil light blinks on and off could pressure switch be bad if so where is it located on a 2000 ford windstar 3.0


Oil Pressure Switch Operation:
00134_oil_pressure_switch_gauge.jpgInformation relay unit for the indicator light or gauge on instrument panel. It contains a diaphragm that responds to changes in oil pressure. When the oil level is over a pre-set limit, the diaphragm opens the switch, turning off the light. When level is below the pre-set limit, the dash light comes on. In later model cars, if the oil pressure drops, the switch turns off the fuel pump, to stop the engine and limit damage to internal parts. Oil pressure switches can be grouped into two categories, units for electrical gauges and for mechanical gauges.

Oil pressure can be checked at the sending unit passage with an externally mounted mechanical oil pressure gauge. To get accurate results from the test, make sure you follow the manufacturer's recommendations and compare your findings to specifications.
Testing the Oil Pressure Gauge
  • Test the gauge by grounding the wire that leads to the sending unit on the block.
  • When the wire is disconnected from the sending unit with the key switch on, the needle on the oil pressure gauge should be either all the way high or all the way low. Grounding the wire should make the needle move to the opposite side of the gauge from where it was before the wire was grounded. If the vehicle is equipped with an oil pressure light, touching the wire to ground and then removing the wire from ground should turn the light on and off.
  • If either happens, the gauge and wiring are good and the sending unit is at fault.
Testing Oil Pressure
Pressure can be tested by temporarily installing an oil pressure gauge in place of the sending unit. Before testing, look up the oil pressure specifications for your vehicle in the appropriate service manual.
  • Bring the engine up to operating temperature.
  • Now shut the engine off.
  • Locate the oil pressure sending unit; usually it is on the lower side of the engine block.
  • Disconnect the wire from the sending unit and use an open ended wrench to remove the sender. Using pliers can damage the unit.
f43-19.jpg An oil pressure sending unit is removed with a special socket. Courtesy of Chrysler Corporation.
  • Tighten the oil pressure test gauge into the hole in the block where the sender was removed.
f11-15_3184.gif Measuring oil pressure. Reprinted with permission.
  • Check the engine's oil level and fill, if required.
WARNING Be extremely careful when working near a running engine. Always wear safety goggles or glasses with side shields when working around moving machinery and be sure that your clothing is not loose.
  • Now turn the engine on and check the oil pressure on the gauge.
    • Watch as the engine warms to note any excessive drops due to temperature.
    • Make sure the engine speed is set to specifications for testing pressure.
    • If necessary, us a tachometer and adjust the engine idle speed.
  • Record the measured oil pressure, then turn off the engine.
  • Compare the test results with the manufacturer's specifications.
    • If the oil pressure is within specifications, this shows that the oil pressure sending unit may not be working correctly.
    • In many cases, replacing the oil sending unit will correct the problem.
  • After the test is complete, reinstall the oil pressure sending unit, start the engine, and confirm there are no leaks.




Nov 17, 2009 | 2000 Ford Windstar

2 Answers

Ford Laser Oil light doesnt show up?


Have a mechanical oil pressure test done. This will verify that the engine has sufficient oil pressure, it may be that the light bulb burned out sense it wont come on even when the key is in the start position.

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