Here is an example of a wiring diagram for one of my cars:
http://bowlsby.net/914/WiringHarnesses/HarnDia_Chassis_1972.pdf
On the drawing, there are numbers that have circles around them. For example, the circled number 27 refers to a combination relay. This is the headlamp relay that switches between high beam and low beam. The legend for the circled numbers (as well as the fuse locations) is at the bottom of the drawing.
Is there a legend for the non-circled numbers? Are these circuits? Where do I find out what the 56 or 56a or F, etc refer to within this relay?
56, 56a, F etc. is usually imprinted on the relay next to the terminal. Same goes for switches and other components.
The very small numbers in the middle of the wires are the width of the conductor part of the wire in millimeters.
The small numbers near the components are, as Mike said, labels for the wire connections on the components. Usually there are labels on the component (relay, switch, etc.).
--DD
The early schematics (1970-73) are presented differently than the later (1974-76) schematics. ON the later schematics the wire sizes are indicated as Dave mentions.
The numbers you refer to on the 1972 need to be studied in context. Sometimes they are position numbers on a multipin connector, other times they are wire numbers that you should be able to match up elsewhere on the schematic. Stare at them long enough and they almost always make sense. There are few errors though...
Since you can't find wire sized in square mm at your local FLAPS, this might be useful.
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