03DelcoRemy Diagnostic Manual130004222020

Page 16 Test 1. Push starter button with key on. 2. Turn on and adjust carbon pile to 100 amp load (60 amp if 24-volt system). 3. Read and record voltage (V9) onvoltmeter. Connect 1. Positive lead of digital voltmeter set on low scale to switch wire lead to which carbon pile is connected. 2. Negative lead of voltmeter to other large terminal on magnetic switch. Test 1. Push starter button with key on. 2. Turn on and adjust carbon pile to 100 amp load (60 amp if 24-volt system). 3. Read and record voltage (V10) on voltmeter. 4. Add voltage loss (V10) to voltage loss (V9), previously recorded, to get total wire voltage loss. 5. Total wire voltage loss shall not exceed: 12-volt system - 0.8 volt 24-volt system - 1.8 volt 6. Replace and repair wiring and connections if voltage loss is excessive. NOTE Perform the following test only if the magnetic switch closed in preceding tests. 3-16. MAGNETIC SWITCH CONTACTOR TEST (See Figure 3-6). With carbon pile connected as instructed in previous Starter Solenoid Circuit Test, proceed as follows: Connect 1. Digital voltmeter set on low scale across large terminals of magnetic switch. Battery voltage will show immediately. Test 1. Push starter button with key on. Voltage will read zero. 2. Turn on and adjust carbon pile to 100 amp load (60 amp if 24-volt system). 3. Read and record voltage (V11) across magnetic switch on voltmeter, then release starter button. 4. Magnetic switch contactor voltage loss (V11) shall not exceed 0.2 volts for 12- or 24-volt system. 5. Replace magnetic switch if contactor voltage loss is excessive. DP-1024 CARBON PILE SECOND WIRE LOSS (10) CONTACTOR LOSS (11) FIRST WIRE LOSS (9) FIGURE 3-6. Solenoid Circuit Wiring and Contactor Test 3-17. TEST COMPLETION. Turn carbon pile off. Remove carbon pile and voltmeter from circuit. Leave solenoid S wire disconnected and temporarily taped for insulation at the terminal. 3-18. MAGNETIC SWITCH CIRCUIT TEST This test must be performed using full voltage of the system. If a 24-volt system was temporarily connected to a 12-volt system for a previous test, proceed to the Alternator Wiring Test, paragraph 3-26. Then, return to this test after the batteries have been reconnected to the 24-volt system. Note that the lead to the S terminal on the starter solenoid remains disconnected from previous tests (See Figure 3-7).