NC30/35 charging circuit

[speedy231278]

As I previously threatened, as I'm bored at work due to the place being in administration and me having sod all to do as I look after the computers, I'm currently writing up a document on how the charging system works, breaks, and is tested and fixed. There are potentially a few differences between the 30 and 35, and I also want to make sure I've got my figures right. Could the usual charging system experts and those others in the know please set me straight on a few facts and figures?

I'm as certain as I can be that the reg/rec unit is located in the same place on the subframe on both bikes, yes?

On the NC35, the alternator output connector is mounted on the right side fairing bracket along with another connector which I think is for the pulse generator, oil pressure switch and neutral switch. On the NC30, there appears to be a similar bracket, but with a plethora of connectors (5?). I presume the alternator output is still located here, and has the same 3 pin connector as on the NC35?

The earth for the loom on the 35 is a large flat ring connector that is bolted to the frame on the right side via the right side fairing bracket (the same one as above). Does the NC30 have the same arrangement, or is it in a different place?

The earth for the battery on the 35 bolts to the frame next to the bolt that secures the top of the shock absorber. The arrangement is different on the 30 as the fiche shows the securing bolt going in through the side, so I assume it bolts to the side of the frame somewhere underneath and to the left of the tank - but where? Any pics, please?

Is the voltage with the ignition switch on but the engine not running a useful figure to measure or not? I make the dangerous assumption that with headlights off, the NC30 figure would not change, but the NC35 would drop by a few tenths of a volt due to the headlights, and possibly a tiny bit more if it has been modified to take 60/55 instead of 60/35s? However, is it really relevant in any case?

At idle with the lights off, the NC30 should produce at minimum 13.0V, with lights on the NC35 will be a little less, probably around 12.8V due to the load.

Both bikes (lights ON for the 30) should produce at bare minimum 13.5V at 5000rpm. Any less is considered poor, and much under 13V will result in the battery not charging properly if the lights are on. 14V or more (up to the limit of 15.5V) is highly desirable.

Alternator output per winding is 12-14V AC, at 5K should be circa 45V. Resistance is 0.1-1 Ohm between any of the wires. Infinite resistance to earth.

I'm bound to have got a few figures wrong here or there, so I thank anyone in advance for any corrections. Also, while I can obviously take some pics of my 35 to do this, if anyone had any pics that show any differences between the charging system on it and the 30, they would be appreciated.

[krisztian_andre]

Alternator connector is a 3 pin on the right side bracket, often missing because of melting/connector eliminated for better contact? Battery earth connector is on the left side near the rear coil, this is same as loom earth connector I think. There is another earth point near the front coil on the left side.