Help Please converting a 'pedal assist only' to 'thumb throttle' for my Fortis 20"

Fr_303

New Member
Hi Guys
Long time viewer first time poster!
I need some assistance and guidance on converting a 'pedal assist only' to 'thumb throttle' for my Fortis 20" 36V 10Ah Foldable Electric Bike
https://www.kogan.com/au/buy/fortis-...electric-bike/


Any help will be greatly appreciated, I have opened my controller and it had a spare cable
Red - +5VP
Green- AX1
Black – GND
But didn’t think it could be that easy to just connect straight into there


Would love to get a Thumb throttle to work on this bike. If anyone can help me out with some advice of where I need to connect the throttle cable to and anything else I need to look out for please.
 

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Tobitonz981

New Member
I'd like to know how to do that too. I think the spare wire is the speed limiter, or it could be the display cable, not sure. I found a thumb throttle with red green and black wires though. So it should just be a matter of splicing them on. If you do succeed in adding a throttle. Let me know how so I can do the same.
 

maartenmrmtr

New Member
you can use the three wires that go to your pedal assist sensor and connect them to a throttle. I you still want to be able to use the pedal assist function alongside the throttle make sure to connect them in parallel. Some controllers have a seperate connector for throttle and pedal assist but if you don't just connect throttle to PAS wires.
 

Thomas Jaszewski

Well-Known Member
you can use the three wires that go to your pedal assist sensor and connect them to a throttle. I you still want to be able to use the pedal assist function alongside the throttle make sure to connect them in parallel. Some controllers have a seperate connector for throttle and pedal assist but if you don't just connect throttle to PAS wires.
Not the case for many controllers.
 

harryS

Well-Known Member
FR33, You might be able to do this. The label on the controller refers to the throttle voltage, where it says "Speed Set: 1- 4.2V". So it will have a throttle input, but it may or may not be connected to the outside?

When you said "spare cable", did you mean there was an un-used three pin connector hanging off the controller and you traced it back to the circuit?

Or are you just looking at un-used solder pads and guessing? .

maartemment, you're mistaken here. The throttle signal is a DC voltage between 1.0 to 4.2V, The PAS signal is a digial pulse train.