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Quick Gauge test

11439 Views 62 Replies 4 Participants Last post by  John Strenk
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For a video, go here:

CJ Speedometer Gauge Quick Test

By: John Strenk


OK, You know what your doing. You don't need a long explanation. Just a test light. Maybe a DVM.

Automotive lighting Asphalt Automotive tire Eyewear Automotive exterior
Yellow Measuring instrument Clock Gadget Electronic device


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'
Add a ground wire from the dash to the (-) negative terminal of the battery to be sure.

Step 1. Start Here

Turn key to ON. Attach your test light clip lead 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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I punctured the insulation near the end of the yellow voltmeter wire-no joy.

There is, however, continuity from the big yellow wire to the yellow wire that is the unused 4cyl tachometer connector (yellow circle). Rather than unwrap the whole underdash harness, I'm thinking I'll splice into that with a new lead to the voltmeter. Do you see any downside to that?


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