Join Date: Apr 2002
Location: Dandridge (Near Knoxville), TN, USA
Re: Aux high beam modulator
There is no magic to them, and there are purchaseable units available which are wire in.
The law here in the USA is that the modulated light cannot be modulated from on to off, but only to a reduced light level, and at a specified frequency. The specifics are in an available federal document, which I have on my computer but it is too large to paste. If you are interested, I could find the section and post the relevant portion. However, since it is not legal in your country it is pretty much a moot point, and you could just use a timer and relay. If I was you, I would just purchase a "wire in" unit from one of the suppliers here and use it. It is easier on the bulbs to use one of the US legal modulators than to develop an on/off flasher. However, as you stated, just using a turn signal flasher to drive a relay capable of the higher current would be very easy to do.
PS: If you were to purchase a modulator for a Gold Wing, it is already capable of driving two headlight bulbs.
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