Armature Terminal Test Tools Needed 1. Put the digital multimeter Function/Range Switch on the 20M resistance (Ѕ) scale. Digital Multimeter Or Equivalent 1 2. Put one test lead to an outer brush terminal (1) and the other test lead to the motor housing (2). There must be more than one megohm resistance. Test for Continuity 3. Do the test again with one test lead on the other outer brush terminal. Brush Holder Test Tools Needed Digital Multimeter Or Equivalent 1 1 Brush Test 1. Put the digital multimeter Function/Range Switch on the 200 ohm resistance (Ѕ) scale. 2. Put one test lead to an outer armature terminal and the other test lead to each brush lead that connects to that terminal.
There must be less than one ohm resistance. 2 3. Do Step 2 again with the other outer armature terminal and brush leads. Brush Holder Test (1) Brush Holder. (2) End Bell. 4. Too much resistance is an indication of corrosion at the connection to the terminal. 1. The brush holders are mounted on the rocker at the commutator end of the motor. Make a visual inspection of the brush holders and the rocker. Ground Test 2. Put digital multimeter Function/Range Switch on the 200 ohm resistance (Ѕ) scale. Put one test lead to a brush holder (1) and the other test lead to the end bell (2). The meter must show overload (OL). 2 1 3. Check each brush holder.
If meter reading is low, the brush holder is grounded. Replace the rocker. Ground Test (1) Armature Terminal. (2) Motor Housing. Power Train Testing And Adjusting 19