When did Jeep CJ gauges stop bouncing around?
There are some slight variations with the Jeeps built from ’72-’75, but starting in ’76 things remain pretty consistent for 10 years. The meter movement in all the gauges have a built-in dampening mechanism which keeps the needle from bouncing around.
Why does my CJ gauge not move from zero psi?
If the needle does not move from zero psi then, either the wiring (open circuit) or the gauge is bad. If it does move, the sender unit is bad. It is very common for the sending units used with the 258 and 232 engines to be inaccurate. Make sure you have a good connection to the sending unit.
What should the temp gauge be on a Jeep CJ?
The Jumper/Regulator Strap is composed of two strips of metal that continuously make and break contact, regulating the output to the Temp gauge to 5 volts. A volt meter applied to the A terminal on the Temp gauge should fluctuate (plus and minus) near 5 volts.
How does the oil pressure sender work on a Jeep CJ?
The oil pressure sender is similar to the fuel gauge sender. The mechanical parts are different, but after that it is basically a coil of resistance wire wrapped around a card and the wiper moves across the winding to change the resistance. The higher the fuel level or engine oil pressure, the lower the resistance.
Can a Jeep CJ7 T5 transmission hold up?
This transmission held up far better and was torque rated for the H.O. 5.0L engine. The Jeep CJ T5 falls short, and you both have gotten “exceptional” service from your transmissions, a testimony to your driving skills and kindness to the transmission. For a stock 4.0L or the original 4.2L inline sixes, the T5 can hold up okay.
Why are all the Jeep CJ gauges dampened?
The dampening mechanism is basically some thick grease on the movement’s pivot points. The reason all the meters are dampened is because the senders do not have a very constant resistance. If you put a good testing meter on the sender while the motor is running you will see the resistance bounce all over the place.
Why does the CJ gauge read higher with higher oil pressure?
The higher the fuel level or engine oil pressure, the lower the resistance. With less resistance, more current flows and the gauge reads higher. The oil pressure sender and fuel sender are both electro-mechanical devices but the temperature sender is not.
The oil pressure sender is similar to the fuel gauge sender. The mechanical parts are different, but after that it is basically a coil of resistance wire wrapped around a card and the wiper moves across the winding to change the resistance. The higher the fuel level or engine oil pressure, the lower the resistance.
There are some slight variations with the Jeeps built from ’72-’75, but starting in ’76 things remain pretty consistent for 10 years. The meter movement in all the gauges have a built-in dampening mechanism which keeps the needle from bouncing around.
How can I check the CJ gauge voltage?
Run an appropriate resistor to the S terminal of the fuel gauge and to ground and check the readings. The temp gauge has the following resistance. A volt meter can be used to measure the voltage between the A terminal of the Temp gauge and ground. It should be pulsing and averaging about 5 volts.
What are the terminals on a CJ gauge?
Fuel gauge S terminal has a pink wire and runs to the fuel sender. Fuel gauge A terminal is the 12V side of the jumper/regulator strap. Fuel gauge I terminal has a red wire and is the 12 V ignition hot wire. Temperature gauge A terminal is the 5V side of the jumper/regulator strap.