Norton Commando Workshop Manual

## Electrical

# J

Polarity note: 2MC capacitors are polarity conscious and correct battery connection must be made. The smaller Lucar terminal blade (rivet marked red), is positive and the larger double Lucar connector torms the negative terminal.
Conclusions :
If meter reading is less than 9v, capacitor is leaking (inefficient) and must be replaced.

### SECTION J25

### HOW TO MAKE UP A ONE OHM RESISTOR

The 1 ohm resistor must be accurate otherwise correct voltage (or current) values will not be obtained.
A suitable resistor can be made from 4 yards 18 S.W.G ( .048 in. dia.) NICHROME wire together with two flexible leads and suitable crocodile clips, see Fig. J8

To Calibrate
Bend the wire into two equal parts.
(a) | Fix a heavy gauge flexible lead to centre bend of the wire, and connect this lead to the positive terminal of a 6-volt battery.
(b) | Connect a voltmeter across the battery terminals.
(c) | Connect an ammeter to the battery negative post.
(d) | Take a lead from the other terminal of the ammeter, connect a crocodile clip to it, and connect to the free ends of the wire (which should be twisted together).
(e) | Move the clip along the wire, making contact with both wires until the discharge reading on the ammeter exactly equals the number of volts shown on the voltmeter. The resistance is then 1 ohm.
(f) | Cut the wire at this point, twist the two ends together and fix a second heavy gauge flexible lead.
(g) | Wind the wire on to a hollow asbestos former 2 in. dia. (approximately).

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