There may be another sender plumbed in the same area that has two connectors. From left to right - Passenger side to driver side: S - from fuel sender A - fuel gauge side of jumper strap I - to ignition-on 12v battery source A - temp gauge side of jumper strap S - from temp sender About these Gauges The meter movement in all the gauges have a built-in dampening mechanism which keeps the needle from bouncing around. The gauge can be tested with the resistances listed above. The other sender with the two connectors is an oil pressure switch. Many thanks to all those who contributed to this article.
You may want to loosen the dash so you can see into it from between the dash and the cowl. Additionally you can save this post to you favourite social bookmarking sites. Off comes the power lead to the temp gauge. You need a good 12 volt connection to the + post and have a good ground to the - post If the gauge shows no activity, then the gauge is bad. This regulator reduces the incoming 12 volts on the I terminal to near 5 volts for both Fuel and Temp meters. The reason all the meters are dampened is because the senders do not have a very constant resistance. If the gauge shows no activity, then the gauge is bad.
If the Ohm reading increased from zero in a; b; c, above then you know where the short is when you remove the wire and the Ohm reading jumps higher. In no way does Wiring Diagram Pictures claim ownership or responsibility for such items, and you should seek legal consent for any use of such materials from its owner. Off comes the power lead to the oil gauge. Connect a resistor to the S terminal of the Temp gauge and ground the other end of the resistor. Oil Sender Resistance These are hard to test but might help choose the correct replacement. This also is why it takes a few seconds for the needles to come up to position instead of snapping to a reading. The other black wire on the sending unit with a tab style connector is a ground to the frame.
Temperature Gauge The temp gauge has the following resistance. It is simple, you may use the save link or you can spot your cursor towards the graphic and right click then pick save as. To be sure the problem is not the gauge, you can momentarily short the wire from the output of the Sender to ground. Make sure it has good contact. Larry Van Every has written a great trouble shooting guide for you.
Make sure it has good contacts. Do not forget to share and love our reference to help further develop our website. It is very common for the sending units used with the 258 and 232 engines to be inaccurate. If it does move, the sender unit or its wiring is bad. Jeep stays in garage - new toyota tundra sits outside! Oil Pressure Sender This sender is on the engine block and looks like a small 2 X 3 inch filter with one terminal.
A volt meter applied to the A terminal on the Temp gauge should fluctuate plus and minus near 5 volts. Note: Imported, after-market gauges have these ranges reversed. The resistance test below is still valid. When voltage is applied, the current flowing though the coil generates the heat necessary for the bi-metallic arm to react and open the contact which stops the current. If the gauge shows no activity, then the gauge is bad.
Morris 4x4 Center®, Morris Motors Co. The other black wire on the sending unit with a tab style connector is a ground to the frame. There are some slight variations with the Jeeps built from '72-'75, but starting in '76 things remain pretty consistent for 10 years. The sending unit can be checked with an ohmmeter to measure the resistance between the round sender post pink wire and ground. Some of these are not commonly available values. A voltage reading at terminal A of the temperature gauge should be approximately 5 volts. It is an oil pressure switch that is supposed to close below 4 psi to activate a dash warning light in some speedometer clusters.
If it reads 0 volts, it has been burnt out. Use a resistor close to the specifications above to simulate the sending unit. If the needle does not move from zero psi then, either the wiring open circuit or the gauge is bad. We thank you for your visit to our website. I'm not running stock exhaust, running headers, aluminum intake off late model 258 one that water runs thru it no smog whatsoever on jeep. Remove the socket away from ground. If it does move, the sending unit is bad.
The sending unit can be checked with the following resistances between the post and ground… Totally Cold high resistance Slightly Warm 73 ohms Beginning of Band 36 ohms End of Band 13 ohms Hot 9 ohms If an appropriate resistor is connected to the S terminal of the temperature gauge and to ground, the above restances can be used to check the gauge. Look at the schematic, and find the fuse for the gauges. Temperature gauge S terminal has a purple wire and runs from the temperature sender. This should show up as 80 psi on your gauge. If it does move, the sender unit is bad.
How you can download this jeep cj7 fuel gauge wiring diagram image? Jeep Cj7 Fuel Gauge Wiring Diagram is one of the pics we found on the web from reputable resources. It is supposed to close above 4 psi and goes to a dash warning light in some speedometer clusters and in other models it sends the signal to the engine's computer. There are some slight variations with the Jeeps built from '72-'75, but starting in '76 things remain pretty consistent for 10 years. There may be another sender plumbed in the same area that has two connectors. Make sure you have a good connection to the sending unit.