KiwiGF, I dont think you read my post
KiwiGF quote" the battery will be charging at several amps at 0.81 volts over it's static voltage, especially if it is low on charge."
I Posted "Without the lights I agree the battery may well be taking a few amps but as the battery voltage will rise quickly to 7.2 volts, the nominal charged value of a good battery, (this is correct and not overcharged) you still only have 0.5 volt higher voltage from the dynamo" 7.75V dynamo with 7.2V battery at this stage is 0.55V, ok I was guilty of rounding it up to 0.5V, no real significance there.
A 6volt battery freshly charged can give 7.2 volts, falling quite quickly to 7 volts if left a short while.
KiwiGF quote "Hi warmshed, 7-6.19=0.81volts," is it????
Back to the problem,
Beezageezauk quote
"The D and F leads from the dynamo to the Voltage Regulator. The power lead from the regulator to an independant ammeter (one from another bike that I know is working properly) and the other side of this ammeter to the negative side of the battery. The earth lead from the regulator to the +ive side of the battery. Guess what!!!.....no difference in the ammeter reading".
Right, wiring it up that way you are reading the dynamo output, so removing any doubt about the wiring. As Your headlight is 35watt, add to your rear light at 5 watts do you have a pilot bulb? this will equate to 6.6 amps at 6 volts (40Watts divided by the voltage to give the current) and dependant on the voltage that the rating of the wattage of the bulb is made. If at 6 volts it should be as said, 6.6 amps, If so 7 volts will put the total current up about 16% getting up to your indicated current. To this you will need to add any charge into the battery (minimal)
However this is different to what you got according to the original post, you said with the Headlights on (your 6-8A as just calculated), you also got a 8 amp charge showing, this would equate to double the output you show when connecting the charging circuit separately. Your wiring or ammeter is faulty.
Sorry if I my post is not too clear its difficult to when trying to make non ambiguous.