MX-5 Miata LS L4-1.8L DOHC (2001)
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if there is continuity, replace the magnetic switch.
Brush and brush holder
1. Verify that there is no continuity between each insulated brush and the plate using an ohmmeter.
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If there is continuity, replace the brush holder.
2. Measure the brush length.
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If any brush is worn almost to or beyond the minimum specification, replace all the brushes.
Standard brush length: 12.3 mm {0.48 in}
Minimum brush length: 7.0 mm {0.28 in}
3. Measure the brush spring force using a spring balance.
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If not within the minimum specification, replace the brush spring.
Standard spring force
15.05 - 20.35 N {1.534 - 2.076 kgf, 3.375 - 4.567 lbf}
Minimum spring force: 5.9 N {0.60 kgf, 1.32 lbf}