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CJ Speedometer Gauge Quick Test By: John Strenk |
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OK, You know what your doing. You don't need a long explanation. Just a test light. Maybe a DVM. |
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One Warning. A poor broken ground
connection or hooking up the plugs incorrectly can quickly burn up the gauges
or sensors. Don’t make matters worse. Double check your connections before
turning your ignition key to “ON” |
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Step 1. Start
Here Turn key to ON. Attach your test clip to a good ground. You may want to disconnect your Ignition coil. These have been known to
burn up if the key is “ON” but the engine is not running. |
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Step 2: Power
test Check for power at the "I" terminal. The test light should glow brightly if you’re getting power. If the light is on go to next step. If it does not work go to Troubleshooting. |
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Step 3:
Regulator Test Test for flash at "A" Terminal. The test light should flash if the regulator is working. If the test light is flashing go to next step. If it is not flashing go to Troubleshooting. |
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Step
4:
Temperature circuit test 1 Remove Temp plug and test for flash at Temp plug: The light should flash as it did in the previous step. If the light Flashes go to Testing Temperature sensor. If it is not flashing go to Troubleshooting |
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Test
5:
Fuel Level circuit test 1. The light should flash just like it did in the previous step. Remove Fuel level plug and test for flash at Fuel Plug: If light flashes go to trouble shooting Fuel Level Sensor. If it does not flash, go to Troubleshooting |
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Test
6:
Temperature circuit test 2 Momentarily ground the temperature plug. The gauge should go to “H” in a few seconds. Don’t leave the plug grounded for any longer. Remove the ground. If the gauge goes to “H” then go to Resistance Tests. If the gauge does not move go to Troubleshooting |
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Test
7:
Fuel Level Circuit test 2 Momentarily ground the Fuel Level plug. The gauge should go to “F” in a few seconds. Don’t leave the plug grounded for any longer. Remove the ground. If the gauge goes to “F” then go to Resistance Tests. If the gauge does not move go to Troubleshooting. |
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For the following test you
will now need an DVM |
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Test
8.
Resistance measurement Temperature Sensor Start your jeep and allow it to warm up. Take your ohmmeter and connect one lead to ground and the other lead to the post on the sensor. Compare your reading to the following chart: Temp. Gauge calibration: Room Temp……………70 degrees—200 to 400 ohms These measurements don’t have to be exact below 130*F. Some where in this resistance range though. If these reading are OK and your gauges still doesn’t work then you need to check your grounds. Refer to the Trouble shooting section |
Test to Base of Sensor ^
Test to Ground ^ |
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Test 9: Resistance test Fuel Level Sender. Take your ohmmeter and connect one lead to the base and the other lead to the post on the sensor. Also test the resistance to the ground on the frame. Compare your reading to the following chart Empty = 73 ohms Note: If you don’t know the fuel level just expect the resistance to be between 73 and 10 ohms. If these resistance readings are OK and your gauges still doesn’t work then you need to check your grounds. Refer to the Trouble shooting section.
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Right to Base of sender ^
To ground,^ Something is wrong,
different resistance |
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