Norton Commando Workshop Manual

## Electrical

# J

Chacking the state of charge
A hydrometer is required for this check. The specific gravity should be checked for each cell and the results checked with the table below:

| SPECIFIC GRAVITY (Corrected to 15°C (60°F) )
Climates normally below 25°C (77°F) | Climates normally above 25°C (77°F)
FullyCharged | 1.270-1.290 | 1.210-1.230
70%Charged | 1.230-1.250 | 1.170-1.190
Dischargod | 1.110-1.130 | 1.050-1.070

Electrolyte temperature correction:
For every 10°C (18°F) below 15°C (60°F) subtract 0.007.
For every 10°C (18°F) above 1 5°C (60°F) add 0.007.
A variation of more than 40 points (0.040) between any cells indicates that the battery is suspect and should be thoroughly checked by the battery manufacturer's agent.
High rate discharge cheak
(Battery must be at least 70% charged).
Connect voltmeter and high rate discharge resistance (0.5 ohm) across battery terminals for 15 seconds.
Directly after 15 seconds the reading should remain steady.
A lower or rapidly falling voltage indicates the battery requires charging or has a faulty cell.

BATTERY VOLTAGE | VOLTMETER READING
12 | 94
6 | 48

### SECTION J7

### FUSE

A 35 amp fuse is fitted into the battery live (negative) lead close to the battery terminal. The fuse is of the cartridge type, in a nylon holder.
Access to the fuse is gained by pushing the fuse-holder body halves together and twisting. At no time must the value of 35 amps be exceeded.

### SECTION J8

### WARNING LIGHT ASSIMILATOR

Lucas Type 3AW (1971 and later models)
This is an electro-mechanical device for ignition warning light control.
With the ignition switched on, the warning light is supplied with battery current; when the engine is started and the alternator output reaches 6 volts approximately, the contacts inside the unit open and break the warning light circuit, switching off the warning light.
should the warning light fail to light when the ignition is switched on and with the engine stationary, disconnect the White/Brown lead from the "W L" terminal of the control unit and temporarily reconnect to the "E" terminal; if the bulb lights, this indicates that the control unit is faulty, but should the light still fail, then the bulb, connections, and associated wiring should be checked.

### SECTION J9

### IGNITION SWITCH (Pre 1971)

The ignition switch is mounted at the front of the lefthand accessory cover. This switch is of the on/off type governing only the ignition circuit. Clockwise rotation turns the ignition ''on" and anti-clockwise "off."

### SECTION J10

### MASTER SWITCH (1971 and later models)

The key operated switch is located to the front of the left hand accessory cover. The switch controls ignition and also energises the lighting system. The switch is a sealed unit requiring no attention other than a routine check on connections. The four switch positions are shown below in Fig. J4.
The Switch Positions are:
1. | Parking Lights Only
| The key may be removed in this position enabling the machine to be parked safely at night.
2. | Off Position
| Again the key may be removed leaving all circuits isolated.
3. | Ignition Only
| The key cannot be removed. This position is used during normal daytime running.

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