Rick,
The Harbor Freight load tester heats a hefty nichrome wire. As someone else noted, it is designed to load an automotive-sized battery. While it is easy to modify one of these testers for motorcycle batteries, these things can actually damage a small batteries because it appears as a dead short circuit.
If there is any interest in how to modify the load tester, speak up and I will do a How-To on it.
My own load tester is a couple of high-wattage resistors. If you only work on bikes now and then, a headlight bulb makes an excellent load tester.
First test: check specific gravity with the hygrometer. Then charge it and load test to determine if the battery is capable of taking on enough charge to act as a Voltage regulator.
Jon Pardue
Sarasota, Florida
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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