Alternator - Bosch K1/N1 Caterpillar

Brush Continuity Test

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Illustration 1	g03224618
Brush continuity test (1) Positive (+) brush (2) Terminal

1. Put the multimeter on the 200 ohm resistance (Ω) scale. Touch the multimeter leads between positive (+) brush (1) and terminal (2) .

2. The multimeter reading should .1 to .3 ohms. If the resistance is not correct, the positive (+) brush (1) is open or shorted and the brushes must be replaced.

Brush Ground Test

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Illustration 2	g03224636
Brush ground test (2) Terminal (3) Negative (-) brush

1. Put the multimeter on the 20 ohm resistance (Ω) scale. Touch the multimeter leads between negative (-) brush (3) and terminal (2) .

2. The multimeter reading should be 100000 ohms or greater (meter reading 0.10 or greater). If the resistance is low, the brush is grounded and the brushes must be replaced.