I don't think it's so much that the battery can't power the headlight, but that it's not hooked up electronically to do so. The battery is something like 3 amp 6V and the headlight is about 25 watt.
Watts = Amps x Volts
so
25 = Draw Amps x 6volts
25 / 6 = draw amps
That's 4 amps, damn more than I expected. In any event the battery could power the headlight for at least a half hour, but it's just not wired to do that. Instead I think it sips voltage from the alternator with the battery pulling off the voltage overages to charge itself.
(imagine a cute or dirty tagline here)
On Wed 13/07/11 3:37 PM , gandalf@sonic.net sent:
> It's kinda the opposite actually. Without the battery there to keep the
> voltage down, the bike makes enough when revved to blow out the headlight
> and the tail light if it's on. The system uses the battery as a voltage
> regulator. So you need a battery and it needs to be not dead although one
> that's not very strong will work.
> (imagine a cute or dirty tagline here)
>
> On Wed 13/07/11 2:12 PM , Chris Bader bader_ct@y
> ahoo.com sent:> Hi,
> >
> > From numerous posts I believe the headlight is
> toast if the engine is> running without a battery and that the bikeonly
> generates enough current to run turn signals, etc. without a> battery.
> >
> > Thanks,
> >
> > Chris
> >
> >
> >
> > ________________________________
> > From: GregH anfindgr
> eg@yahoo.com>To: Hon> da
> -C70@yahoogroups.comSent: Sunday, July 10, 2011 11:59 PM> Subject: [Honda-C70] c70 headlight
> question>
> >
> >
> > I am working on a c70. I had to disconect the
> ignition to get spark to it.> When it is running the headlight does not work.
> I find this a little odd> because other bikes I have will still power the
> headlight when the engine> is running without a battery. What can I do to
> fix this ? >
> >
> >
> >
> > [Non-text portions of this message have been
> removed]>
> >
> >
> > ------------------------------------
> >
> > C70 Passport Not Running Right?
> > 1970-73 C70 Honda Service Manual: http://tinyurl.com/6ebwtw1970-73 C70 Troubleshooting
> Guide: > http://tinyurl.com/6ebwtw (scroll to sec.7.1
> page> 101.jpg)1980-83 C70 Honda Service Manual: http://tinyurl.com/hu42c1980-81 C70 Troubleshooting
> Guide: > http://tinyurl.com/hu42c (scroll to sec.18-1
> page> 170.jpg)1982-83 C70 Troubleshooting Guide:
> > http://tinyurl.com/hu42c (scroll to sec. 20-28
> page> 205.jpg)
> > 1980-81 C70 Maintenance Schedule: http://tinyurl.com/z4zn61982-83 C70 Maintenance
> Schedule: http://tinyurl.com/hw35c> More resources for C70 Passports and
> Cubs:> http://www.shlaes.com/Vehicles/Scooter.htmhttp://www.velodrome.
> com/HondaC70/HondaC70.htmlYahoo! Groups Links> To visit your group on the web, go
> to:> http://groups.yahoo.com/group/Honda-C70/> Your email settings:
> > Individual Email | Traditional
> >
> > To change settings online go to:
> > http://groups.yahoo.com/group/Honda-C70/join(Yahoo!
> ID required)>
> > To change settings via email:
> > Honda-C70-digest@yahoogroups.com Honda-C70-fullfeatured@yahoogroups.com> To unsubscribe from this group, send an email
> to:> Honda-C70-unsubscribe@yahoogroups.com> Your use of Yahoo! Groups is subject
> to:> http://docs.yahoo.com/info/terms/>
> >
> >
> >
>
>
> ------------------------------------
>
> C70 Passport Not Running Right?
> 1970-73 C70 Honda Service Manual: http://tinyurl.com/6ebwtw1970-73 C70 Troubleshooting Guide:
> http://tinyurl.com/6ebwtw (scroll to sec.7.1 page
> 101.jpg)1980-83 C70 Honda Service Manual: http://tinyurl.com/hu42c1980-81 C70 Troubleshooting Guide:
> http://tinyurl.com/hu42c (scroll to sec.18-1 page
> 170.jpg)1982-83 C70 Troubleshooting Guide:
> http://tinyurl.com/hu42c (scroll to sec. 20-28 page
> 205.jpg)
> 1980-81 C70 Maintenance Schedule: http://tinyurl.com/z4zn61982-83 C70 Maintenance Schedule: http://tinyurl.com/hw35c
> More resources for C70 Passports and Cubs:
> http://www.shlaes.com/Vehicles/Scooter.htmhttp://www.velodrome.com/HondaC70/HondaC70.htmlYahoo! Groups Links
> To visit your group on the web, go to:
> http://groups.yahoo.com/group/Honda-C70/
> Your email settings:
> Individual Email | Traditional
>
> To change settings online go to:
> http://groups.yahoo.com/group/Honda-C70/join(Yahoo! ID required)
>
> To change settings via email:
> Honda-C70-digest@yahoogroups.com Honda-C70-fullfeatured@yahoogroups.com
> To unsubscribe from this group, send an email to:
> Honda-C70-unsubscribe@yahoogroups.com
> Your use of Yahoo! Groups is subject to:
> http://docs.yahoo.com/info/terms/
>
>
>
>
1970-73 C70 Honda Service Manual: http://tinyurl.com/6ebwtw
1970-73 C70 Troubleshooting Guide:
http://tinyurl.com/6ebwtw (scroll to sec.7.1 page 101.jpg)
1980-83 C70 Honda Service Manual: http://tinyurl.com/hu42c
1980-81 C70 Troubleshooting Guide:
http://tinyurl.com/hu42c (scroll to sec.18-1 page 170.jpg)
1982-83 C70 Troubleshooting Guide:
http://tinyurl.com/hu42c (scroll to sec. 20-28 page 205.jpg)
1980-81 C70 Maintenance Schedule: http://tinyurl.com/z4zn6
1982-83 C70 Maintenance Schedule: http://tinyurl.com/hw35c
More resources for C70 Passports and Cubs:
http://www.shlaes.com/Vehicles/Scooter.htm
http://www.velodrome.com/HondaC70/HondaC70.html
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