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Rear Fog Lamps and recommendations
regarding electrics generally.
With the introduction of rear fog lamps at the start of the 1980 season the standard 7 pin plug and, socket (12N Normal) will be supplemented by a second 7 pin plug and socket (12S supplementary).
The fog lamps will use No. 2 of the l2N plug which was originally designated internationally as a spare but has come to be used, for interior lights and equipment. All pins in the normal 7 pin socket will therefore be used for road lights.

The second 7 pin plug and socket (125 supplementary) is introduced to cater for auxiliary services. 'The 12S will differ from the 12N which we already use, in two important respects.
1. The centre pin in the socket is replaced by a tube and vice versa in the plug (to prevent inadvertent connection to the 12N).
2. The 12S will be different in colour (to aid identification).

The test requirements in T.S.O. will ensure a greater current carrying capacity than in some existing 7 pin plugs and sockets. This is important in view of requirements for refrigerator operation and the passing of an adequate charging current from car to caravan. The contacts so far allocated on the l2S connector are as follows.

1. Yellow Reversing light and/a reversing catch on inertia brakes.
2. Blue No allocation
3. White Common return
4. Green Power supply
5. Brown Sensing device, i.e. warning light with common return.
6. Red Power supply
7. Black No allocation

This caters for all present requirements and gives two power supplies, one for operating a refrigerator and the other for charging the caravan battery. The technical committee of the N.C.C. hope soon to be able to recommend which of the two power supplies should. be used for the refrigerator.
The cable specified. will be 6 cores of 1.5mm and one of 2.5mm. the colours of which must match the connectors standard. The 2.5mm will be white for allocation to the common return. Cable to this standard must be used not only for the refrigerator and charging currents through the l2S but also through the 12N in order to meet voltage drop restrictions on the common road lights.
The I.S.O. standard 3559 - 1976 limits voltage drop at road lamps to 1 volt. The voltage drop is the difference between the voltage at the 7 pin socket terminals and each lamp with all position, stop, indicator and rear fog lamps working. It is likely that the B.S.I. will adopt this standard and it will then be necessary (by the overall wording in B.S. 4626) to incorporate its requirements in the Badge Scheme.

Thomson Wiring Diagrams

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