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Let's test the meter first. Remove from the car, slide the grey switch all the way to the right & turn the rotary two clicks clockwise. Touch the two leads probes together & the display should change to zero & the meter should beep.
If it does, return the switches to where they were & use a disposable battery to test.
If that works then try the car again, making sure that you have good contact with the terminals. Just balancing the probe like the red in your pic is unlikely to achieve that. Can't see the black so don't know what you've done there. |
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