Troubleshooting GP Repairwc_tx000548gb.fm 1006.22 Checking Voltage to Auto Idle SolenoidSee Graphic: wc_gr003130Electric shock hazard. Only qualified personnel should conduct thistest.Problems with the auto idle system can be classified into one of twocategories: electrical problems with power to the idle solenoid orproblems with the mechanical linkage. Before checking the electricalsystem, check the governor mechanical linkage (a) to make sure it’sfunctioning properly.Electrical problems can be further broken down in to two categories: 1)power generation by the generator, 2) problems with the electricalcircuit feeding power to the solenoid.6.22.1 Start the generator.6.22.2 Unplug the two white/red wires (b) from the idle solenoid. Measure thevoltage between the two wires. There should be 28±2VDC.• If 28±2VDC is measured, the idle solenoid is receiving the correctvoltage. If the idle solenoid is receiving the correct voltage but isstill not functioning, confirm that it is bad by measuring the resis-tance of the solenoid’s coil. The coil should measure 26–33Ohms. Replace the solenoid if the correct resistance is not mea-sured.• If 28±2VDC is not measured, continue.6.22.3 Stop the generator.6.22.4 Remove the screws which secure the control panel to the enclosure.6.22.5 Remove the 5A fuse (c). Start the generator and check the voltageacross the fuse holder. There should be 20–29 Volts.• If 20–29 Volts is measured, the source of the problem is in the cir-cuit from the fuse to the idle solenoid.• If 20–29 Volts is not measured, the source of the problem is in thecircuitry between the fuse and the DC winding.6.22.6 Reinstall the 5A fuse (replace the fuse if it is blown).WARNING
