03-03-2022, 05:11 PM
My RP is fitted with the later 35M instrument but still charging through an early (CF1?) cutout with no internal resistors. Half charge is achieved with a separate 2 ohm power resistor under the dash.
Om winter charge, the dynamo is just about getting into its stride at about 30mph (about 2000 rpm) and gets to full output at about 35. At this point my ammeter is reading about 10 amps, but, as Rekkers has pointed out above, it shows a slight discharge with the headlamps on. I suspect that my ammeter is a bit vague and, whilst it tells me whether the dynamo is charging or not, I wouldn't place too much reliance on the figures it shows.
I think that a more accurate way of determining safe charging rate is to measure the voltage at the battery. My dynamo gives 6.7 volts at 'max chat' which is about what I would expect.
Om winter charge, the dynamo is just about getting into its stride at about 30mph (about 2000 rpm) and gets to full output at about 35. At this point my ammeter is reading about 10 amps, but, as Rekkers has pointed out above, it shows a slight discharge with the headlamps on. I suspect that my ammeter is a bit vague and, whilst it tells me whether the dynamo is charging or not, I wouldn't place too much reliance on the figures it shows.
I think that a more accurate way of determining safe charging rate is to measure the voltage at the battery. My dynamo gives 6.7 volts at 'max chat' which is about what I would expect.