03DelcoRemy Diagnostic Manual130004222020

delcoremy.com Page 15 NOTE For starters with an integral magnetic switch, use the test procedures specific to those starters. NOTE When testing 24-volt systems, use the same temporary 12-volt connection as for the Battery Cable Test, paragraph 3-7. 3-14. SOLENOID CIRCUIT VOLTAGE LOSS TEST (See Figure 3-5). Disconnect 1. Lead to S terminal on starter solenoid. Connect 1. Carbon pile to switch wire lead and to starter ground terminal (a small clamp or jumper wire may be helpful). 2. Positive lead of digital voltmeter set on low scale to solenoid BAT terminal. 3. Negative lead of voltmeter to switch wire lead to which carbon pile is connected. Meter will show battery voltage. NOTE In the following step, if the magnetic switch does not close on a 12-volt vehicle, perform Magnetic Switch Circuit Test, paragraph 3-18, then return to this point in the Starter Solenoid Circuit Test. NOTE In the following step on a 24-volt vehicle, if the temporary 12-volt system will not close the magnetic switch, bypass it with a heavy jumper connected between the two large studs on the magnetic switch. Electrically this does the same thing as pushing the button and closing the switch. With no button to release, the jumper must be disconnected after each voltage reading. Test 1. Have assistant push starter button with key on. Listen for sound of magnetic switch closing. Voltmeter reading should be zero. 2. Turn on and adjust carbon pile to 100 amp load (60 amp if 24- volt system). 3. Read and record voltage (V6) onvoltmeter. 4. Voltage loss shall not exceed: 12-volt system - 1.0 volt 24-volt system - 2.0 volt 5. If circuit voltage loss is less than maximum, solenoid circuit is okay, turn off and disconnect carbon pile and proceed to Magnetic Switch Circuit Test, paragraph 3-18. If voltage loss exceeds maximum, loss is excessive. This may be caused by loose terminals, corrosion, too small a wire, switch located too far from starter, or worn out magnetic switch. Perform Wiring Test, paragraph 3-15, and Magnetic Switch Contactor Test, paragraph 3-16, to isolate the problem. VOLTAGE (6) CARBON PILE FIGURE 3-5. Starter Solenoid Circuit Test 3-15. WIRING TEST (See Figure 3-6). With carbon pile connected as instructed in previous Starter Solenoid Circuit Test, proceed as follows: Connect 1. Plus lead of digital voltmeter set on low scale to solenoid BAT terminal. 2. Minus lead of voltmeter to a large terminal on magnetic switch. If voltage shows, reconnect lead to other large terminal on magnetic switch. NOTE In the following step, on a 24-volt vehicle, if the temporary 12-volt system will not close the magnetic switch, bypass it with a heavy jumper connected between the two large studs on the magnetic switch. Electrically this does the same thing as pushing the button and closing the switch. With no button to release, the jumper must be disconnected after each voltage reading.