Posted by SadFarmall on January 31, 2011 at 23:10:56 from (58.170.232.135):
In Reply to: light switch problem posted by Fuller's Farmall on January 31, 2011 at 20:02:34:
First, the magneto will have nothing to do with the problem. There are various possibilities.
1). Poor contacts in wiring system. Check all contacts, especially for generator and voltage regulator (or generator High / Low charge switch).
2). Dead short. If the lamp circuit is fused the fuse should blow instantly. If not, wiring will become very hot quickly and begin to burn.
3). Defective winding in voltage regulator (if fitted). Test regulator and cut-out operation. Generator should cut in at about 6.5-6.8Volts and cut out at 5.5 Volts. With generator at full speed it should show between 7.5 and 8.1 Volts. At 70 deg. F. it should show 8 Volts.
4). Defective field winding in dynamo. Check for short circuit or low resistance between field terminal and Earth.
5). Defective ammeter. Test system with another ammeter.
6). Defective battery. Test battery.
Do you have a wiring diagram?
Does the system appear to charge normally with the lights switched off.
Can e-mail wiring diagrams and test diagrams if you need.
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