Husqvarna model 24 blowing rear bulb

Fråga: Now I’ve got my engine going fairly reliably – with your help in the past – but now with the engine running at a fairly fast rpm the rear light burns out (blows). I’ve blown 4 bulbs to date.

When I rebuilt the magneto lighting coils I had to shorten one of the coils by only one turn because the wire had broken off at the terminal post.

Otherwise the coils are as original. With my voltmeter I cannot get a proper reading from the wire leading to the rearlight. The voltmeter fluctuates wildly from zero up to 20volts and back to zero many times a second. What’s going wrong?? How can I fix it?? I’ve checked my voltmeter on different batteries and it seems to be accurate.

Does a magneto produce AC or DC?? Engine is Husqvarna model 24.

Thanks again

Edward Hunt

 

Svar: The lightning coils in the Stensholm ignintion system has 220 turns of 1 mm insulated copper wire. With 6 volts, each turn of the coil produce 6/220 = 0,027 Volts. The loss of a few turns will not make any difference.

The magneto produce alternating current (AC), and the multimeter must be put in to AC mode to measure correctly.

These old ignition systems don´t have any voltage regulation. To keep the voltage low both light bulbs must have the correct power that is 25 watts in front and 2 watts in the rear (both 6 volts). If one of the bulbs ar broken (or missing) the voltage vill rise and damage the remaining bulb. If the front bulb (25 watts) ar broken or missing the voltage rise vill be very big and the rear bulb vill blow within seconds.

Jim Lundberg

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