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Fix Radwagon Harness Controller question

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Fix Radwagon Harness Controller question

Old 01-10-20, 03:41 PM
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Bomba88
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Fix Radwagon Harness Controller question

Hello, new to the group, I inherited a Radwagon from a Storage auction which looks like it was in a wreck. I have a new battery but no power and looks like wiring harness from conroller to display was crushed so most likely pins/connector is not working, I tried to re align the 10 pins, or the controller is shot. Anyone know of any wiring /connectors I could use to bypass and check if controller is faulty or how to diagnose 10 pin connector with a multimeter? Or if another forum is more appropriate
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Old 01-10-20, 05:48 PM
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Source for parts & possible info:

https://www.radpowerbikes.com/blogs/...ric-cargo-bike
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Old 01-11-20, 01:22 AM
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You can buy a new but different display and controller for under $100 (not from rad bikes) and generally replace everything, It's a bit of rewiring, but probably less money than buying the Rad parts. If you're good at splicing, you'll learn how the bike electrics are done .

Gimme that bike and that's what I would do. .



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Old 01-13-20, 12:42 PM
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Any sites you can recommend to purchase these cables? Would I also have to get a new controller? I am not sure if it needs replacing yet....
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Old 01-13-20, 10:39 PM
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Saw your picture in the other forum, This is between the display and the controller?

Which side was damaged the most? Cable coming out of controller or harness toward the handlebars? The harness branches out to probably a 5 pin plug for display, 2/3 pin for brakes, and a 3 pin for thrrottte.

The fact that the display powers up means it is getting battery power and ground. THe display can power up with a dead controller. WHen I said 5 pins in the display, those are two of them. A third will be a start wire going back to controller. It will be zero and go to battery power when the display comes on. That is what turns on the controller. The other two are serial data lines, in and out. Error 30 ("communication error") means the display cannot find any data on its incoming line. Could be one of the data lines is broke, or the controller never powered up.

If you unplug the throttle, you can probe for +5V across two of the three pins after the display lights up. If there's no power there, the controller didn't power up.

You can also have fun opening the controller (no battery connected!) and mapping the 10 signals from inside the controller to the round connector in your picture. Then you can do the same for the harness pins for to its peripheral connectors. Finally connect the harness and check continuity all the way out to the four plugs on the end of the harness. You don't need to know it works to do that and it will tell you if the wiring is good.

I've never seen a Rad product up close, but have seen about a half dozen controllers/displays and they are as I described here.


Last edited by Doc_Wui; 01-13-20 at 10:45 PM.
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