i think i have that on my site already.
feel free to take it
it's under
Service
Wiring Diagrams
if i have it, you welcome to it. if not
can you scan it for me Bill :o)
Shane Rivet
USCRA#121
srivet@rivetrestorations.com
http://rivetrestorations.com
http://www.race-uscra.com
"HRS"
IS REAL!! AND THERE'S NO CURE!!!
No, There's no App for that....
Honda Recovery/Restoration Syndrome
-------- Original Message --------
Subject: Re: [Honda-C70] Re: Voltage Regulator
From: william belleau <wjbelleau@yahoo.com>
Date: Fri, June 17, 2011 2:34 pm
To: Honda-C70@yahoogroups.com
Jon
I have a Haynes C50, C70 & C90 1967 to 2003 Service Manual that has
a wiring diagram of the C50-C, C70-C and C90-C diagram with a Regulator/
Rectifier unit unit. I will scan it at work Sunday night and post it and
the section in the
shop manual that talks about it.
Bill
Portland OR
--- On Fri, 6/17/11, jpardue <inventorpardue@hotmail.com> wrote:
From: jpardue <inventorpardue@hotmail.com>
Subject: [Honda-C70] Re: Voltage Regulator
To: Honda-C70@yahoogroups.com
Date: Friday, June 17, 2011, 8:52 AM
Paul and Mike G. both ventured good comments.
Paul began "Not exactly my question, since I was asking about the 12V
version of the C70" and "whether the OP might have avoided problems with
his battery. I would assume the 6V problems and 12 V problems are
similar so that your answer would also apply to a 12 V C70?
You are correct, lack of a proper Voltage regulator affects both models.
Paul continues "Now, if I may open a larger can o' worms, what are the
issues that affect the 6V bikes that pose problems for off the shelf
VR's? Or will that answer take a book to answer? Please keep it to
layman's terms as much as possible, I'm not an electrical engineer, I
only know enough to get myself and others into trouble."
I'm a technician and inventor, not an engineer. At idle, Cubs produce
low AC headlight Voltage. At idle DC Voltage from the rectifier is less
than battery Volts, so the DC-powered brake lamp, tail lamp, dash lamps,
horn and blinkers draw most of their Volts from the battery.
As engine speed increases, AC headlight Voltage and DC charging Voltage
keep climbing. The total electrical load of the headlight bulb, battery
charging, lamps and horn limit the maximum Voltage the system can reach.
Maximum Voltage happens at high RPM cruise with only headlight, dash
illumination and tail lamp lit, after the battery fully charges.
With clean electrical connections and good battery, any missing load -
even the dash or tail lamp - allows Voltage to increase, straining the
headlamp filament. A good battery "absorbs" the extra Volts at high RPM.
Dirty or broken connections and/or a bad battery will allow the Voltage
to skyrocket and nuke the light bulbs.
Mike G. commented "IIRC, the Euro bike use a special regulator/rectifier
to change ALL the AC from the generator to DC and send it to the battery
to power everything - the ignition, lights, etc. - unlike our AC/DC
USA-Types. It's used in conjunction with a ballast resistor on the
headlight circuit to protect the systems when the light is turned off
(something we can't do in the USA).
That said, I would like to see exactly what the Euro model regulator
does, and its connections. It very well COULD work on a USA-Type. It has
to connect up with the same wires, clip the voltage at the right point,
and have enough heat sink to do it continuously at full throttle without
melting."
Got no wiring diagram for a resistor-equipped Euro Cub with a regulator.
Anyone have a copy?
Mike G. is correct regarding the 12 Volt USA model.
I would accomplish the change as follows:
Rewire headlight switch to battery power.
Rewire original headlight power to rectifier circuit.
Replace rectifier with rectifier/regulator.
The rectifier/regulator used on the Honda Spree will suffice.
The resistor would not be needed for always-on headlight bikes.
A larger capacity fuse might be needed.
If the Ignition Switch or fuse shows signs of heating or duress, it
would be simple to add a headlight relay and separate fuse.
The only real unknown is how the rectifier/regulator will handle the
possibly unbalanced AC Voltage/Amps from the stator. Should be fine.
If someone wishes to try this, I will draw the wiring diagram.
Paul's 6 Volt Cub answer: Voltage regulators need more Volts going in
than they put out. The 6 Volt Cub's low idle Voltage renders a regulator
a blockade to power. 6 Volt bikes have been my focus for some time, and
a clever new rectifier/regulator kit design is evolving on my bench.
Will publish results when I have something good.
Jon Pardue
Sarasota, Florida
[Non-text portions of this message have been removed]
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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