Starting Motor - Delco 50-MT Caterpillar

Field Winding Ground - Test

Illustration 1	g00715885
Field winding ground test (1) Field winding leads (2) "Mtr" Motor terminal

Note: A visual check of the field windings should be done first. Check for wear and damage. Check all of the connections for imperfections in the solder joints.

1. Place the multimeter in the "20M Ω" range. Touch the multimeter leads between each field winding lead (1) and the case of the starting motor.

2. Touch the multimeter leads between the "Mtr" motor terminal (2) and the case of the starting motor.

3. Each reading should be greater than 100,000 Ohms. The multimeter should read "0.10" or a value that is greater.

4. If the meter reading is less than 100,000 Ohms, the field winding is grounded. The case of the starting motor and field windings must be replaced.

Field Winding Continuity - Test

Illustration 2	g00715887
Field winding continuity test (1) Field winding leads (2) "Mtr" Motor terminal

Note: A visual check of the field windings should be done first. Check for wear and damage. Check all of the connections for imperfections in the solder joints.

1. Place the multimeter on the "200 Ω" range. Touch the meter leads between the field winding leads (1).

2. Touch the meter leads between each field winding lead (1) and motor terminal lead (2).

3. Each reading should be "00.0" to "00.1" Ohms.

4. If the meter reading is higher than the meter reading in Step 3, there is an open in the field winding. The case of the starting motor and the field windings must be replaced.