Ok, now I feel like I have to throw my hat into the ring now, lol.
From my experience owning and working on many different electric golf cars (carts for us older folks), I've learned some facts about some basics:
- Relay carts are jumpy and will never obtain the same distances as a controller cart
- Relay carts are not super user friendly
- Controllers make things nice and simple to work on and operate.
- If you know where to look, parts are cheap, most cart owners are willing to barter for things like snowmobiles, trailers, and other things to trade a cart for.
Check out a place called
Buggies Unlimited and their
Forum. you should be able to find what you need there or at least some leads to where you can get it.
I didn't really pay close attention to what kind of voltage you are looking to use on your motor, but there are a few guys on there that are running drag carts with 120V DC+.
There are many good articles on there for helping you to pick out the proper motor for what you need as well.
Hope this stuff can help you out a bit.