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Thanks, that's extremely useful information. My motor has no internal gearing, so from what you say it's got a better chance of working with a generic controller, and it does work, though not as smoothly as the original Gazelle set up. The information on the third wire out of the battery...

Thanks, the two wires emerged from the motor coils and were soldered straight into the round controller circuit board in the hub. Unfortunately it was not possible to determine their function from that, though if they're not Hall sensor related it saves me the hassle of opening up the hub again...

Additional info - I checked the original controller circuit board and have identified which of the brown wires is connected to ground with a continuity meter, so therefore I know which is which of the two wires in the hub. That should rule out potentially damaging experimentation. Mike

I previously posted regarding refurbing an unreliable Orange Innergy https://www.pedelecs.co.uk/forum/threads/gazelle-orange-innergy-intermittent-loss-of-power-assist-function.40446/#post-604040 and the responses guided me in the right direction - thanks. The main guidance I followed was here...

Tracing the wiring was not conclusive but the 9v supply certainly ends up at the hub, where I understand the controller is housed (not behind the headlight as with some earlier Innergy models). A posting elsewhere says of this supply "The third white wire from the battery is a linbus data...

I'll do that. If it has that function it's going to be a low current drain, and I'm thinking that it could be supplied by an independent power source such as a PP3 battery.

There are three outlet pins, the middle one -ve, the others +36V and +9V. What is the function of the lower voltage? Presumably no supply to this would lead to the (unspecified) disappointment. Thanks.

Further research and observation has pretty conclusively established that the battery is the problem, with its range due to age being about 20 miles maximum. Recelling it is complicated, not guaranteed and not for the fainthearted, and replacement Gazelle batteries are phenomenally expensive. As...

Thanks, it's useful to have that voltage as a reference point. I've rigged up the voltmeter on the bike and will go for a monitoring ride tomorrow, I'm pretty certain that's what I'll find.

Thanks, testing the voltage on load makes sense. I should be able to make up some leads to fix the meter across the charger socket and monitor the voltage as I ride. If that proves the battery is at fault I'll look into replacing the cells.

I have a Gazelle Orange Innegry Electric Bicycle which is inconsistent in its reliability. It's 10 years old, has had moderate use but is in great condition and worth keeping running. It has a Bronze 36v/252Wh battery. Here's the sequence of events leading to loss of the power assist function...