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That is a great looking electric trike! I am very familiar with Aurenthetic because I own a couple of their mini bikes. I have not got around to restoring them yet so they are just sitting in storage but one day I do plan on fixing them up.

The best thing to do is as you said is to keep the original motor. I would install large deep cycle batteries (the kind used for boat trolling motors) that fit in the original battery mounting tray so the trike has a long mileage range. The only new electrical parts that are needed are a throttle and speed controller. A new throttle and speed controller will give the trike infinitely variable speed, as opposed to only having two speed that the original solenoid based speed control system provided.

Back when Aurenthetic electric trikes and mini bikes were made transistor technology was not where it is today so electric motor speed controllers were simply not available. These days with advances in transistor technology electric motor speed controllers are relatively cheap and abundant.

I got one of my Aurenthetic mini bikes running with its original electronics and it had two speeds; very slow, and full speed. Very slow was the solenoids engaging one of the batteries (12 Volts) and the speed was around 3-4 miles per hour, and full speed was the solenoids engaging both batteries in series (24 Volts) and the speed was around 15 or 20 miles per hour if I remember right. Anyways with a new throttle and speed controller you will be able to go from zero miles per hour all the way to top speed and everywhere in between, with full speed control just like the throttle on a gas engine.

The parts I recommend for the electric trike are as follows:

SPD-601000A 24-60V 700-1000W Electric Scooter/Bicycle Speed Controller With Throttle $89.95
This speed controller is under rated by the factory and actually puts out a lot more than 1000 Watts when it is under load so it will have plenty of power for the 1 horsepower motor. It also comes with a throttle.

Here is a link to the page that the SPD-601000A controller is on: http://www.electricscooterparts.com/speedcontrollers24volt.html

And here is a link to the wiring directions for the SPD-601000A controller: http://www.electricscooterparts.com/hookup/SPD-601000Awiring.htm

You could reuse one of the existing solenoids on the trike to turn the power on and off between the battery pack and controller. Or you could use a new 24 Volt relay or solenoid if the old ones are not working.

That's pretty much it. All it needs is a throttle and speed controller.

Feel free to upload pictures of the project when it is underway or completed. I would really like to see it when it is back in running condition. Please let me know if you have any questions.

We have other 24 Volt controllers that have built in wiring for the battery charger, brake lights, and running lights, however they are not powerful enough to run the size motor that is in an Aurenthetic. For an Aurenthetic the lights and turn signals would need to wired independently from the controller. If the trikes original wiring is intact then the lights and turn signals should already be properly wired.

You are welcome to visit our store to go over everything. We look forward to helping you find the parts that you need.