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Charging and lighting

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Charging and lighting

Post  john87 on Mon Nov 13, 2017 12:48 am

Ok, so I have got my falcon 81 up and running.

First thing, is that the lights are brilliant, why on earth anyone would want to convert to 12V is beyond me. If anything, the charging system is too good, with the ammeter showing a charge at all times UNLESS you have the lights on the "battery" setting. Put them "off" or on "direct" and you have about a 2 amp charge..

Anyway, sticking with 6 volts. I am using the original rectifier.. I know that everyone throws these away and fits a "modern" bridge rectifier, but, and this has bothered me for some time, how on earth do you wire it up???

The bike was built so that you have one lighting coil charging all the time, whether the lights are "off" or set to "pilot", and then, when you turn the head lamp on, the two other coils get connected too, so you have three coils charging.

How can you do this with a bridge rectifier?? So far as i am concerned, it is completely impossible, as, the two coils, are not in phase with the third, so you have a choice, either use the one, or two, but not three,

Fit a bridge rectifier and you are going backwards in a BIG BIG way by partially shorting out your lighting coils.. [and worse!!!] i will talk about the "even worse" bit later..

Debate......

john..


Last edited by john87 on Mon Nov 13, 2017 9:34 am; edited 1 time in total

john87

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Rectifier

Post  Bigjim on Mon Nov 13, 2017 6:57 am

Normally old bikes used the rectifier in a half wave mode. It was just to charge the battery. A bit of a waste as it only allows have the current through.
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Bigjim

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rectifier..

Post  john87 on Mon Nov 13, 2017 9:31 am

Ok, so who is going to draw out the current paths and tell me why a bridge rectifier is not suitable and why..

john..

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Charging

Post  kerabo on Mon Nov 13, 2017 12:02 pm

12v don't automatically mean brighter lights, it's the power the bulb draws in Watts that will give the bright lamp.
I have the wiring for the small square rectifier should anyone need it.

Ken
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kerabo

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Age : 67
Location : Falcon 87. Trials 93 Special. Powerbike 56. Falcon 81 Green Lane bitsa. Sunbeam S8. Honda Deuville.

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Ancient rectifiers

Post  FB vincent on Mon Nov 13, 2017 12:16 pm

The main problem with ancient selenium rectifiers is that they tend to allow a reverse current flow which will flatten the battery. If you use the Forum 'Search' function you will find lots of discussions on this subject. I had to replace the original rectifier on my AMC/Wipac Falcon 87 for this reason, but the Villiers/Westinghouse rectifier on my Falcon 81 still soldiers on.

Sandy

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Charging and lighting

Post  john87 on Mon Nov 13, 2017 12:33 pm

Hi Ken,

"12v don't automatically mean brighter lights, it's the power the bulb draws in Watts that will give the bright lamp"

1000% CORRECT


I have the wiring for the small square rectifier should anyone need it.

Can you post it on here?? Or email me how they do it??

john..

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Rectifier

Post  kerabo on Mon Nov 13, 2017 12:45 pm

I will try but seem to have problems posting picture

Ken


Last edited by kerabo on Mon Nov 13, 2017 1:11 pm; edited 1 time in total
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kerabo

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Charging and lighting

Post  john87 on Mon Nov 13, 2017 12:48 pm

Me too!! I have never managed it...

john..

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Rectifier

Post  kerabo on Mon Nov 13, 2017 12:49 pm

Wiring for rectifier


Maybe not then

If you pm me your email I will send it that way

Ken
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Re: Charging and lighting

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