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Old 05-06-2009, 03:14 PM
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Electrical/Electronic Guru needed!

Okay here is the situation: I have a Harley Davidson FLTCU with a grand total of about 38 lights on it. It has two head lights, front wheel lights and the whole back end is lit up like a Christmas tree and when I turn on the lights everything lights up (no problem there). Here in Florida we have to run the head lamp during the day time. I have seen a lot of crotch rockets that only run one head light and I want my big cruiser to be the same way. Under the law it is not required to run anything else but one head light during the day time. I don't want to tear into the harness and solve this problem with a complete rewire or splicing in a bunch more unnecessary gadgets. I hate running all of these lights in the day time but I sure do like it at night.

My solution and here is where I need help, would be to run a fused power supply with a small switch on it to the low beam positive on one of the head lights. I would leave the factory positive power supply to the low beam on this headlight intact but I would install a one way diode in it. That way it would not get feedback voltage to the rest of the lights. This bike is wired from the factory with a two position ignition switch; one position is for run with out lights and the other position is for run with lights.

Please let me know if this sounds like a good way to do this and what diode I should use.

Thanks, Chris

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Old 05-06-2009, 05:08 PM
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Hi Chris,

IMO, there is one small problem with your plan. The diode would be located on the leg of the circuit that would provide power to the headlamp in 'night mode'. The problem is that there is a side effect to using a diode in this way - the diode will drop the voltage passing through it by about .6v, which may cause a noticeable difference in brilliance between your two headlamps at night.

I propose a different, yet equally simple solution:

You could use a double throw switch to choose whether the 'day light' is powered from the headlight switch (night mode) or directly from a fused power source (day mode), as (poorly) illustrated below:



There are other possible solutions as well, but this is the simplest one I could come up with.


Hope this helps

Joe G.
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Old 05-06-2009, 06:20 PM
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Quote:
Originally Posted by Joe G

You could use a double throw switch to choose whether the 'day light' is powered from the headlight switch (night mode) or directly from a fused power source (day mode), as (poorly) illustrated below:

Joe G.
Why didn't I think of that? And it's a no brainer too. A double throw switch would work great. I have plenty of room in the fairing and I can do most of the wiring from the headlight bucket. Oh and don't sell yourself short Joe, it's not (poorly) illustrated! Great Idea!

Thanks a lot!
Chris
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