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Disconnect only what's going to the negative (low end) lug. Measure from that lug to the wiper lug, and rotate the control stop-to-stop. The meter should show a smoothly-changing ohms value, from very low to very high. (The wiper is the middle lug between the bottom and top-end lugs.)
Or does the meter show open circuit (infinite resistance) thru the full range of rotation?
Last edited by old_coot88; 06-25-2020 at 01:10 AM.
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