Harley Davidson Dyna evolution 1991-1998. Service manual — page 4

Voltage Drop Test

Before performing the steps listed under Troubleshooting, perform the voltage drop tests listed here. These steps will help you find weak or damaged electrical components that may be causing the starting system problem. You need a voltmeter to test voltage drop.

1. To check voltage drop in the solenoid circuit, connect the positive voltmeter lead to the positive battery terminal; connect the negative voltmeter lead to the solenoid. See Figure 15.

NOTE

The voltmeter lead must not touch the starter-to-solenoid terminal. Figure 16 shows the solenoid terminal with the starter/solenoid removed for clarity.

2. Turn the ignition switch on and push the starter button while reading the voltmeter scale. Note the following:

a. The circuit is operating correctly if the voltmeter reading is 2 volts or less. A voltmeter reading of 12 volts indicates an open circuit.

b. A voltage drop of more than 2 volts shows a problem in the solenoid circuit.

c. If the voltage drop reading is correct, continue with Step 3.

3. To check the starter motor ground circuit, connect the negative voltmeter lead to the negative battery terminal; connect the positive voltmeter lead to the starter motor housing. See Figure 17.

4. Turn the ignition switch on and push the starter button while reading the voltmeter scale. The voltage drop must not exceed 0.2 volts. If it does, check the ground connections between the meter leads.