Checking the Generator


For checking the electrical system the following test instruments are required: One Voltmeter range 0 - 20 Volts

  1. One voltmeter range 0 - 20 Volts.
  2. One ammeter range 10 - 0 - 60 Amps.
  3. Load resistance (adjustable) of 500 Watts nominal capacity.


Extinguishing of the ignition warning light after starting and with increasing engine speed gives no guarantee for charging of the battery. If the wiring system is in order incorrect charging of the battery, i.e. excessive or too little charging current, will be indicated by bad starting, weak headlamp illumination when starting at night. Abnormally high water requirement by the battery should lead one to suspect excessive charging current, checking can be carried out initially without removing the generator or having to uncover the regulator. In the first instance the condition and tension of the V-belt should be checked.

Regulator Voltage No Load

  1. Undo battery lead from terminal B+ on regulator and temporarily insulate cable shoe. The positive lead of the voltmeter should be connected to termianl "D+ / 61" and the negative lead to earth.
  2. Start the engine and run the generator up to double the rated speed, the voltmeter must then show the correct regulator voltage.

    If the prescribed voltage is not reached generator and regulator should be overhauled.

Regulator voltage on load


  1. Connections as in Fig. 5 but the A. M. should be connected in series with the control resistor between terminal B+ on regulator and earth.
  2. Start engine, increase speed up to generator test speed and keep constant. Adjust resistor until the A. M. indicates the corresponding test voltage. At this setting the voltmeter must indicate at least 12 V with a generator in good condition.
  3. If during this test the generator gives off no current it must be removed and repaired.
Last modified: Sat, 15 Jan 2005


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