Norton Commando Workshop Manual

## Electrical

# J

3 | The adjustment screw should be tuned while operating the horn until the ammeter indicates the appropriate current consumption (see below). Turn the screw clockwise to reduce the ammeter reading.
NOTE :
1 | Do not under any circumstances disturb the centre core slotted screw and locknut.
2 | It is essential, when adjusting on the vehicle, that the wiring is not overloaded. This couid be caused by attempting to sound the horn, while the contacts are out of adjustment, and hence do not open. If the horn supply is fused, the fuse should beshorted out until adjustment has been completed.
Contacts Setting Data

High Note Horn
| Setting Current | Setting Voltage
12 volt | 3.0 - 3.5A | 13 volts
Special Low Note Horn
| Setting Current | Setting Voltage
12 volt | 3.0 - 4.0A | 13 volts
Horns should be checked for a good clear note over the following voltage range.
12 volt | 11-12-15 volts

### SECTION J23

### HORN ADJUSTMENT (SINGLE STANDARD HORN)

The horn is shown in Fig. J7 with the adjustments crew arrowed. Adjustment will take up wear on the moving parts which, if not attended to, will cause roughness and a loss of performance.
To adjust the horn, operate the horn button and slowly turn the adjustment screw anti-clockwise until the horn just fails to sound. Release the horn button and turn the adjustment screw clockwise one notch at a time until the original performance is regained. The amount of adjustment may be expected to vary between a quarter and three-quarters of a turn. Note that if original performance is not restored, the horn must receive attention by the electrical manufacturer.

SECTION J24
ELECTROLYTIC CAPACITOR 2MC
The capacitor is an electrolytic polarised type, spring mounted to the rear of the battery. This unit will be damaged beyond repair if it is connected incorrectly. The small (3/16 in.) terminal is the Positive ground (earth) terminal with a red spot on the terminal rivet. The double terminal is the Negative connection. The capacitor should only be fittod with the terminals pointing downwards. The battery may be removed altogether or be completely discharged whilst the 2MC capacitor permits normal starting and running. With the capacitor in use, the lights may be used whilst the engine is running though there is no parking facility.
Periodically the capacitor should be tested by disconnecting the battery terminals - the negative terminal should be insulated to prevent a possible short circuit. Start and run the engine - full lighting should be available. If the engine fails to start and run, test as follows:
(a) | Disconnect capacitor.
(b) | Connect capacitor direct to 12 volt battery for 5 seconds (see polarity note).
(c) | Disconnect battery and let charged capacitor stand for 5 minutes.
(d) | Connect D.C. voltmeter across the terminals (see polarity note) and note the steady reading* which should not be less than 9v for a serviceable unit.
*Some meters may show immediate needie overswing which should be ignored.

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