 Wiring diagram question, Circled numbers versus circuit numbers? |
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| vin man |
 Feb 21 2017, 02:56 PM
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#1
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Member  Group: Members Posts: 178 Joined: 19-February 10 From: Gilbert, Arizona USA Member No.: 11,380 Region Association: Southwest Region  |
Here is an example of a wiring diagram for one of my cars:
72 Wiring 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? |
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| Mike Bellis |
Feb 21 2017, 05:56 PM
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#2
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Resident Electrician Group: Members Posts: 8,345 Joined: 22-June 09 From: Midlothian TX Member No.: 10,496 Region Association: None 
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56, 56a, F etc. is usually imprinted on the relay next to the terminal. Same goes for switches and other components.
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| Dave_Darling |
Feb 21 2017, 11:02 PM
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#3
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914 Idiot Group: Members Posts: 14,982 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California
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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 |
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| JeffBowlsby |
Feb 22 2017, 12:37 AM
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#4
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914 Wiring Harnesses Group: Members Posts: 8,492 Joined: 7-January 03 From: San Ramon CA Member No.: 104 Region Association: None
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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... |
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| vin man |
Feb 22 2017, 09:26 AM
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#5
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Member Group: Members Posts: 178 Joined: 19-February 10 From: Gilbert, Arizona USA Member No.: 11,380 Region Association: Southwest Region |
QUOTE(Jeff Bowlsby @ Feb 21 2017, 11:37 PM)  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... Thanks. Jeff - also want to thank you for hosting the site that I grabbed the drawings from. Most helpful. |
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| GeorgeRud |
Feb 22 2017, 09:34 AM
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#6
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Advanced Member Group: Members Posts: 3,725 Joined: 27-July 05 From: Chicagoland Member No.: 4,482 Region Association: Upper MidWest |
Since you can't find wire sized in square mm at your local FLAPS, this might be useful.
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| Dave_Darling |
Feb 22 2017, 11:26 PM
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#7
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914 Idiot Group: Members Posts: 14,982 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California
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QUOTE(Jeff Bowlsby @ Feb 21 2017, 10:37 PM) The early schematics (1970-73) are presented differently than the later (1974-76) schematics. Whoops, forgot about that! Yeah, I'm used to the 74+ diagrams, since my car is a 74. --DD |
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