All Other Models

1985 Ford Thunderbird Base, 2.3 W, StandardSECTION All Other Models
  1. Connect an ohmmeter to terminals 1 and 2 on back of potentiometer. With dial in "OFF" position, ohmmeter should read 8000-12,000 ohms. Move dial to "MAX" position. Ohmmeter should read 2800-4600 ohms.
  2. Connect ohmmeter to terminals 3 and 6. There should be continuity with dial in "OFF" position and no continuity in any other position.
  3. Connect ohmmeter to terminals 2 and 6. With dial in "OFF" position, ohmmeter should read 8000-12,000 ohms. With dial in any other position, ohmmeter should read about 100 ohms. If not, replace indicator bulb. See Fig 1 .
Fig 1: Continental, Cougar, Mark VII & Thunderbird Potentiometer Test Locations
G2025
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

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  • β€’ You are not confident in the next step or safety outcome.