No Problem Bob, thanks very much for the info!
Unfortunately, my FCS has been stripped out after the burning and there is nothing in there apart from the upper switch contacts. I'm pretty sure from the wiring that someone has fed it 240v, I need to tidy the wiring up as they have just taped it up inside there. This is not something I feel a great need for; I don't use the automatic function, though I may like to repair it sometime in the future, I would assume that the best way forward is going to be if I can fit some sort of modern replacement inside the original housing.....
Anyway, back to the charging, thanks for those measurements. I was trying to get a resistance on the remainder of mine and got approx. 5 ohms, so I reckon that 7 ohm should be about spot on. I actually bought a new replacement resistor for a slightly more modern start o matic which I spotted on ebay recently thinking the values should be similar; now I can check it out and see
The dimensions are different but layout is the same....
Any idea what causes the resistor to fail? A short somewhere? I had a feeling maybe it was to do with someone running it without a battery connected and the +ve contacting the -ve or the frame?
Any idea what the second resistor in mine does? Looks identical to the charge resistor, but the wires too/from it go into the generator housing; could it be acting as a shunt resistor?
Thanks for your help; hope you had a great Christmas, and have a happy new year.
Cheers,
Jonny