TM 5-3805-262-20E-4. TROUBLESHOOTING (CONT)c. Check troubleshooting index for most likely cause, then identify the circuitthat is malfunctioning.d. Study the electrical schematic to learn which components, harnesses, or wirescould contribute to or cause the malfunction.NOTERemember, when tracing circuits on the electrical schematic, that youshould always start at the positive (+) side of the battery.Currentwill flow outward from that point through the circuits and return to thenegative (-) side of the battery by way of ground wires and the vehicleframe.e. Make necessary tests and checks to isolate circuit or component as outlined inthe troubleshooting section of this technical manual.f. Make repairs, if you’re sure.If not, continue to isolate the malfunction, orask for help from your foreman or supervisor.g. After repairs, make sure everything has been re-connected and tightened.h. Make operational checks to verify that the system/circuit is functioningproperly again.E-5. TROUBLESHOOTING LOGIC TREEFigure E-1 is a Troubleshooting logic tree.It is designed to help you develop aquick logical way of approaching an electrical troubleshooting problem.E-6. ELECTRICAL SYMBOLSFigure E-2 shows you the basic electrical symbols used with most schematics. Theywill help you read and understand the electrical circuits.E-2
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