TM 9-2350-287-20-12-17. ELECTRICAL TROUBLESHOOTING.a.Electrical troubleshooting in this section provides schematic diagrams and pictorial views to give clear insight to thelocation of harnesses and components involved.b.When troubleshooting any electrical system or component, exercise extreme care to prevent electrical shock.WARNINGThroughout troubleshooting of the electrical system or electrical components, becertain MASTER switch is OFF between every step unless otherwise directed.Remove all jewelry and metal objects when working on the electrical system toprevent injury due to electrical shock.c.The multimeter is used throughout electrical troubleshooting. Ensure when using the multimeter that it is used with aprobe kit.d.When doing a shorts test, make sure all connectors and/or leads are disconnected from their components. Probe thepins (or sockets) with a multimeter. This is done by placing the red lead on pin (or socket) A (or 1) and then placingthe black lead on the next pin (or socket) in alphabetical (or numerical) order. Probe every pin (or socket) on theconnector or lead with the black lead of the multimeter.e.When this probing has been completed, place the red lead on the second pin (or connector) and do the probing withthe black lead in order again. Do this until every pin has been probed with the red lead of the multimeter. Then placethe black lead of the multimeter on the connector and place the red lead on each pin (or socket) on the connector.f.If continuity is present between any two points, a short exists. Shorts must be repaired to continue any operation.g.If instructed in a procedure to skip a pin (or socket) during a shorts test, that is because that pin (or socket) is not usedor is shielded. Those pins (or sockets) will be covered in separate troubleshooting.h.When a repair or replacement of a lead or harness has been done, do the shorts test again to make sure the problemhas been corrected.2-34
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