A Dynamo uses a regulator box to control volatge and current going to battery. Alternator don't need them as it is built in. If you have converted to electronic ignition, good choice by the way, then as long as you have followed the destructions that should work fine.
The Regulator consists of three coils with spring contacts. As long as it is working correctly leave very well alone.
1. Fit dynamo to cradle. DO NOT at this stage wire it up. Fit battery.
2. Take a jump lead from the power feed side of the battery. If you are on Positive earth this will be the - Negative side of battery. Touch the jump lead once to the Feild F contact on the Dynamo. This will polarise the Dynamo.
3. at this point wire up the Dynamo to the regulator box. Check, Double check, fit and CHECK again. Get this wrong and it will really hit the fan.
4. Check battery voltage it should be around 12 volt.
5. Start engine.
6. check voltage on idle. it should be around 13.6
7. Rev engine it should go no more than 14 v.
8. Assuming you have all the following go on your way rejoicing.
If the voltage goes up to 14.6 or above there is a problem with the regulator.
not wanting to teach you to suck eggs but to much info rather than to little. At this stage check amp meter. The meter should read about 25 amp then drop. If the Amp meter goes into discharge. 1. Check you have it wired correctly. 2. If there is still a discharge, then the dynamo or regulator may be at fault. at this point yell for futher help.