Vitesse Vigour Electric Mountain Bike for Adults, 60 Miles Range, 9 Speed Gears with 250w Mid Motor and Front Suspension for a Smooth Comfortable Ride, 18” Frame and 27.5” Wheels

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If you connect the dynamo to a battery just with bits of cable it should run like a starter motor but very slowly.... If it runs? it's ok if not? it is kapput.

The field coil resistance is 6.3, measured with dynamo fitted. Is this a tad too high to make much difference?.Make sure its machine sensed. i.e. the two B+ terminals are shorted internally or externally together. The alternator to battery feed cable will work but a parallel cable will allow more loads to be added without visible volt drops. Hi. I have hopefully diagnosed this as the dynamo, as with a connecting wire between the 2 dynamo terminals give rapidly fluctuating readings of between 4 and 6 volts.

Thanks for that info guys. Just wanted to be certain I couldn't be doing anything wrong, as the tests on old and new unit gave the same readings. My ignition light is on at rest and with the engine idling, so maybe I can assume the cut out is currently working?, before I replace the dynamo. Hi. Have fitted the recon dynamo. The voltage, direct from dynamo, is reading similar to the old one.