There may be another sender plumbed in the same area that has two connectors. So, if this fuse blows one of two things has to be happening: a. Some of these are not commonly available values. Pull the fuse out of the panel to remove voltage to the gauges. And if the strap needs to be replaced where can i get one? Larry Van Every has written a great trouble shooting guide for you. With less resistance more current flows and the gauge's meter registers higher.
If it reads 12 volts, the regulator in the Fuel Gauge is bad. All trademarks and registered trademarks are the property of their respective owners. The higher the fuel level or engine oil pressure, the lower the resistance. The sending unit can be checked with the following resistance between the post and ground. There are some slight variations with the Jeeps built from '72-'75, but starting in '76 things remain pretty consistent for 10 years. Both gauges usually need to be replaced at the same time in either case. Jeep Cj Oil Pressure Gauge Wiring Diagram Service This excellent jeep cj oil pressure gauge wiring diagram that provides along 7 pictures furthermore perkins 4.
The closest standard values are 75 ohms, 22 ohms, 12 ohms, 10 ohms, and you may even have trouble finding the 75 ohm, so you could use either the 68 or 82. Shorts to ground If you find nothing. Their technical support should know why that is. Ohm meter still at zero? This process repeats itself over and over again. Use their respective instructions and diagrams during replacement.
The closest standard values are 75 ohms, 22 ohms, 12 ohms, 10 ohms, and you may even have trouble finding the 75 ohm, so you could use either the 68 or 82. The other black wire on the sending unit with a tab style connector is a ground to the frame. The sensor's probe extends into the head's water jacket. Use this information and your Jeep at your own risk. Oil Pressure Gauge From the passenger side, left to right in the picture. Dave Mellow has some great tips about grounding and your Jeep's electrical system. Connect a resistor to the S terminal of the Temp gauge and ground the other end of the resistor.
A reading of 12 volts on the temperature side indicates a bad regulator. The dampening averages out the reading. It is easiest to test the sending unit by temporarily plumbing in a good mechanical gauge. Both gauges usually need to be replaced at the same time in either case. It should be pulsing and averaging about 5 volts. Morris 4x4 Center®, Morris Motors Co. Use a resistor close to the specifications above to simulate the sending unit.
Off comes the power lead to the fuel gauge. It should be pulsing and averaging about 5 volts. If it does move, the sending unit is bad. A volt meter applied to the A terminal on the temperature gauge should fluctuate plus and minus near 5 volts. It is upright and cylindrical with one wire attached to its center post.
The wire going from the fuse to the gauges and lamp must be shorting to ground. All other marks, names, and logos mentioned on this web site are the property of their respective owners. There are some slight variations with the Jeeps built from '72-'75, but starting in '76 things remain pretty consistent for 10 years. The terminal to the far right should have the red wire connected to it. Looking at the gauge from the back, the pink wire goes to the signal terminal which is connected to the fuel level sending unit. It is very common for the sending units used with the 258 and 232 engines to be inaccurate.
Oil Pressure Sender This sender is on the engine block and looks like a small 2 X 3 inch filter with one terminal. Temperature Gauge The temp gauge has the following resistance. Oil Pressure Sender This sender is on the engine block and looks like a small 2 X 3 inch filter with one terminal. The three groups are separated by insulating bushings, rust lots of that , grease, and just plain looseness. Inside of fuel gauge showing mechanical voltage regulator There is a mechanical voltage regulator inside the fuel gauge to reduce the voltage to 5 volts for both the fuel and temperature meters. The sensor's probe extends into the head's water jacket.