Nh350

[Petebarn]

Trying to sort my dynamo out it's fully rebuilt but when I connect it to a 6vlt battery it spins the opposite way to the direction of the arrow on the body ,,is this correct

[keith.mettam]

Hi Pete,
Have you tried 'flashing' it for correct polarity first ? When 'motored' on a battery the armature should spin in the same direction as it spins when fitted on the motorcycle (anti-clockwise looking at the brush/commutator end on your NH). If it doesn't and you have the correct (earth) polarity lead connected to the dynamo's body when trying to 'motor' it, try swapping the field coil wires over in the dynamo which, hopefully, will solve the problem.
All the best with it,
Keith.

[Petebarn]

Thanks Keith wires were wrong changed them over dynamo spins the correct way very slowly and about 1vlt reading

[Petebarn]

Update on dynamo hands up I had it completely wrong all wiring was correct my fault was try to power it up as a motor completely wrong ,as a last resort I cleaned the brushes which are brand new heypresto it charges ,just goes to show check the simple things first

[pete.collings]

Glad to hear dynamo is now working OK, I had borrowed a dynamo from a friend in case there were still problems, and spent the morning cleaning and checking it out, spinning it with a drill gave 7-8 volts, so at least I can tell him it works!

[Petebarn]

Thanks Peter there was no doubt that the dynamo was good just my stupidity let me down

[keith.mettam]

Pleased you figured it out Peter, another hurdle over !
All the very best,
Keith.

[Petebarn]

Thanks Keith next step is to check the timing if I put it on full retard it stops but I'm enjoying relearning every thing I've forgotten from 50 years ago

[Petebarn]

Mag timing tight or slack cable ,the cable is on the right looking at the points cover

[pete.collings]

Cable on right at points end is tight wire advance