TROUBLESHOOTING (CONT)

TM 9-2320-285-24-2

E-4. TROUBLESHOOTING (CONT)

a. Find out how the system works under normal conditions and how to operate it.

b. Make sure the malfunction or trouble reported to you "really" exists. ("Dead batteries" could end up as a "failure to

start" because of a faulty neutral start switch or the transmission shift lever not fully engaged in neutral.) Try to duplicate

the trouble so you can be sure you're on the right track.

c. Check troubleshooting index for most likely cause, then identify the circuit that is malfunctioning.

d. Study the electrical schematic to learn which components, harnesses, or wires could contribute to or cause the

malfunction.

NOTE

Remember, when tracing circuits on the electrical diagram, that you should always start at the positive (+)

side of the batteries. Current will flow outward from that point through the circuits and return to the

negative (-) side of the batteries by way of ground wires and the vehicle frame.

e. Make necessary tests and checks to isolate circuit or component as outlined in the troubleshooting section of this

technical manual.

f. Make repairs, if you're sure. If not, continue to isolate the malfunction, or ask for help from your supervisor.

g. After repairs, make sure everything has been reconnected and tightened.

h. Make operational checks to verify that the system or circuit is functioning properly again.

E-5. TROUBLESHOOTING LOGIC TREE

Figure E-1 is a Troubleshooting logic tree. It is designed to help you develop a quick logical way of approaching an

electrical troubleshooting problem.

E-2