Generac Power Systems IM Series - Manual (Page 14)

TROUBLESHOOTING THE RV GENERATOR
Introduction
The service technician can use this troubieshooting guide
to determine the cause of existing problems. Six common
problems are covered in this section. Problems are not
arranged in any particuiar sequence.
The first step in troubleshooting is to identify your par­
ticular problem. When you have identified your problem,
locate that problem in the troubleshooting guide on this
page. When working your way through the step-by-step
procedure for that problem, start at Step 1 and follow
through the step-by-step procedure. Each step is ar­
ranged in a definite sequence, from the more prob-
abie/easiest to check to the less probable/more complex
to check. When the cause of the problem is found and
corrected, stop the test.
Follow the step-by-step procedures carefully. After com­
pleting each test, read the TEST RESULTS. Some test
resuits may instruct you to skip certan steps and proceed
to a new step number.
Problem No. 1- Engine Won’t Crank
Step 1- Check 15 amp Fuse FI
Step 2- Check Battery
Step 3- Check Starter Contactor SC
Step 4- Check Starter Motor SM
Step 5- Check Start/Stop Switch SW1
Step 6- Check Control Relay CR1
Problem No. 2- Engine Cranks, Won’t Start
step 1- Check Fuel Quantity
Step 2- Check Fuel Shutoff Valves
Step 3- Check Fuel Flow
Step 4- Check Fuel Filter
Step 5- Check Fuel Pump
Step 6- Check Engine Ignition System
Step 7- Test Choke Module
Step 8- Check Automatic Choke Operation
Step 9- Check Engine Compression/Condition
Step 10- Test Control Relay CR2
Problem No. 3- Engine Cranks and Starts,
Shuts Down When Start/Stop Switch is
Released
Step 1 - Check Engine Oil Level
Step 2- Check Oil Pressure Switch
Step 3- Check Control Relay CR1
Step 4- Check Stator Battery Charge Windings
Step 5- Check Resistor R1
Problem No. 4- Engine Starts Hard, Runs
Rough
Step 1- Check Engine Ignition System
Step 2- Check Carburetion
Step 3- Check Engine Compression
Step 4- Test Automatic Choke
Problem No. 5- Engine Won’t Shut Down
Step 1 - Check Start/Stop Switch
Step 2- Check Wire #18 & #0
Step 3- Check Engine Ignition System (I.S.D.)
Problem No. 6- Loss of Generator a-c Out­
put
Step 1- Check Circuit Breakers CB1/CB2
Step 2- Check Vehicle Wiring
Step 3- Check a-c Voltage and Frequency
Step 4- Check Load Voltage and Frequency
Step 5- Check/Adjust Engine Governor
Step 6- Check Field Boost Circuit
Step 7- Check Stator Excitation Windings
Step 8- Check Stator a-c Power Windings
Step 9- Check Rotor (Field) Circuit
Step 10- Check Voltage Regulator Sensing
Step 11- Check/Adjust Voltage Regulator
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