However, if the test indicates normal starter current but low cranking speed, check the resistance in the starting circuit. If high starter current is encountered during the test, starting circuit trouble is indicated. In the case of low starter current, accompanied by low cranking speed, or complete failure of the engine to crank, look for resistance within the starting circuit wiring or starting motor.
To conduct the starter insulated circuit resistance test on a 6-, 12-, or 24-volt series system, perform the following:
VOLTMETER leads of the tester, as shown in views A, B, and C of figure 4-25, for the type of current being tested, and observe the polarity as you make the connections. The voltmeter will read off-scale
Figure 4-25.-Starter insulated circuit resistance test.Continue Reading