Very true.
Makes me want to change to 24V from 12V.
There is space in front of rear mud guard for another, even larger, battery in my motorcycle CD70.
6V wiring is sturdy thick, lots of copper.
--- In Honda-C70@yahoogroups.com, Dan Novinger <denoving@...> wrote:
>
> Hello. One problem that I've seen with all sorts of electrical problems is that over time the original honda electrical "push together" inline wire connectors can become corroded from high humidity [like is seen in florida], and rain water if you ride in the rain or ever get the motorcycle wet. I've seen CT70's that don't work because half of the electrical connectors are effectively an electrical "open" circuit because the corrosion is so bad. Copper tends to form a greenish oxidation, which is nonconductive. It can be cleaned off with emery cloth or electrical contact cleaner. The contacts may need to be replaced if the corrosion has "eaten" away enough copper metal. The replacement contacts can be purchased at any autoparts store. If you need to replace one connector, you should inspect [and clean] all of the rest of them. After you pull the wire connector apart [use pliers carefully so as not to damage the wire or connector]
> separating the connection, and clean or wipe off the male "plug", and squirt some contact cleaner into the female or "socket" end of the connection, then plug back together, and using an ohmmeter, and measure the contact resistance. A good connection should measure in the ones of milliohms or less. A fair connection is 10 milliohms or less. You should probably replace any contact connection that measures higher than 10 milliohms after being cleaned and reconnected. The reason for that is that a 10 milliohm resistance if you have 20 amps [lights on plus spark] then the power burned up across that connection is I squared x R = 20 x 20 * 0.01 ohms = 4 watts. This is the upper limit of what's acceptable if your electrical load with lights on is 20 amps [something you can also measure with an ammeter - get one at lowes or electrical supplies store].
>
> What happens is, with 4 watts, the wire will dissapate the heat, but that's probably the upper limit of what you want to accept for contact resistance. Another way to lower the contact resistance is to parallel another contact. Bottom line is you want a low resistance contact, and with corrosion, you won't get a low resistance contact.
>
> These old motorbikes, some are 6 volt systems, and that causes the current to be pretty high.
>
> So, anyway, good luck with this electrical problem. I know how frustrating troubleshooting electrical problems on these old motorbikes.
>
> regards,
> Dan
>
> [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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