M-Series Circuit NumbersAmerican M-Series military vehicles follow a common system of electrical circuit numbers. This simplifies maintenance procedures and training of military mechanics who have to work on many different vehicles. In some cases it allows common parts to be used for multiple applications.
For a more complete listing of military standard circuit numbers than the table on this page, consult this file based on TACOM's Ordnance Drawing 7070301 [285k PDF download].
M-Series Military Vehicles Circuit Numbers
Every electrical line in the vehicle will have small metal tags crimped around the wire near every junction or connector. The metal tag will bear a number and that number uniquely identifies what electrical circuit the wire is carrying. All wiring is black so the metal tags are the only ID for you to use, unlike color-coded commercial vehicle wiring. Electrical components, such as switches, recepticles, and lights may also have the same identifying numbers. If they come with pigtails, there will probably be a tag on each wire. If they just have a socket, the circuit number may be part of the housing or painted on. If you make any changes to your vehicle wiring, try to preserve the wire tags and to properly tag anything you add. That will help you or the next owner when the time comes to try to understand what you did. If you can stamp military style metal tags, great. If not, use other wire label methods but use the correct numbers. In order to help you when you service your vehicle or make any changes to its wiring, here is the list of numbers. The information on this list was compiled from PS Magazine, #38 (1955) and TM 9-8000 Principles of Automotive Vehicles (1956). No one vehicle has all of these circuits and most wheeled vehicles use only a small subset of them. Related information is available on Olive-Drab in the article about the wiring of the M-Series Light Switch and turn indicators. Note that not all numbers are used; if a number is skipped in the table, it is unassigned. If you find any error in this table, please contact Olive-Drab.com.
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