Wiring Diagram - How To Read Instructions

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Section General Information

Classification GI86-008

Bulletin No. TS86-027

Date March 13, 1986
HOW TO READ WIRING DIAGRAMS


Effective with the publication of the recently distributed 1986 D21 Truck Service Manual, two changes have been incorporated to assist technicians when servicing vehicle electronic components. In the future, these changes will be incorporated into all new model Service Manuals.

I. Because wiring diagrams are now found in more than just the EL Section, the "How to Read Wiring Diagrams" information has been moved to the GI Section for ease of reference.



II. As shown in the example below, direction marks are now being used in various electrical service procedures. These marks will clarify the connector side (terminal or harness) being serviced, and are used mainly in illustrations indicating terminal inspection.