Hello ATV connection
I hope this Thread is in the correct place.
I put this on another forum and no one was able to get back to me with advice.
I assume everyone is working ?
Personal Story ahead : I got High functioning Asperger syndrome. I have this problem with my brain that I have to diagnose anything until my brain melts and the device is working. Also I have some limited language issue.Some other irrelevant limitations are also present

Me and the UNIT are in the States ( MI )

Well , I received a Yardsport Electric YS36 from an auction and now I am left to troubleshoot the unit.

I worked on this unit for 48 Hours straight now and I am unable to get the motor to run.
EVERYTHING including break light is working but it does not MOVE.

This is what I have done so far.:

I checked the SHUNT Motor by itself and its running properly when hooked up to the battery. ( F1 F2 A1 A2 )
I checked a visible relays close to the batteries ( JD1912 ) using a 12 Volt Battery and my Fluke Multimeter and it is OK.
The preowner bought new Batteries ( Refurbished ) and I checked them with a nice charger
( The Polarity of the batteries was reversed ( -4 Volt , so the charger would not charge it until I hooked up another battery to it and when it startet charging I unhooked the "Macgyver" Batterie ) . After charging for a day and a night all the lights where GREEN and steady and using a nice charge and discharge Device I was able to check if the Batterie had been damaged. The Batteries are in gooood condition.
It looked like someone had already worked on this unit and maybe did some reverse charging by accident.

I love electronics a lot but there are 2 things that I cannot properly Identify. (The control unit pinouts and the copper thing in the pictures)
And one last thing : It seems like there is a relays missing in the Front of the Vehicle. The socket for the Relais has the same dimensions as the JD1912 Relais in the back of the vehicle. ( I made a copy of the JD1912 40 AMP relays using another Relays that I had laying around 35 AMPS ) but the vehicle is still not moving. SO I assume the pinout is different or it maybe a "normally closed" ( I tried that with my relais and it did not work so maybe the wiring is different )

I have absolutely no knowledge of the "controller BOX" or how to test it. What I am able to do is open it up and do some rework on it or replace a chipset ...

I traced the Throttle "switch" and it is functioning properly ( the more I press the Gas the more the OHMS change )
Also I traced the GAS Paddle ( close to the throttle switch ) and there was another switch ( on off ) that is closed whenever the Throttle is pressed in any way.I am unable to find schematics on the Web about this controller unit , but was able to trace some of the wires ( like throttle and the mini switch when the "Gas Pedal " is pressed.
The Forward and reverse switch is working and i traced them to the control unit pins.

On the control unit there is a gray wire that is pulled out its on the same string of wires as the Throttle ( OHM changer ) and the switch that is closed when you press the "Gas" Pedal. (Its definately not the throttle but the other switch ! )

I will now post a lot of pictures and I am hoping that you could help me narrow down the problem. Sorry if the pics are overkill.

I was not able to find a DIODE that may have been burned due to the reverse voltage. ( Maybe on the inside of the controller unit ? )
Could someone please tell me the workings of the control unit on how I can check it ? A PINOUT would really help me. Maybe someone could take a look at his ATV and tell me what he things are the PINS. There is another component that I was not able to identify but it seems like its a COPPER looking Relays with 2 BIG Red wires going to it and on top there is 2 tiny wires. Ill post that picture.
Please let me know what info may be missing..
Oh ! And please see the picture of the 2 wires in my hand. One of them goes to the relays in the back and the other end I dont know where it should go. And another gray wire where I dont know where to hook it up to.

The person that is helping me to make the step to fix it will get 100 Dollars using Paypal for your time.

Please message me your thoughts and maybe a Video conversation using Facebook messenger would be nice to narrow down the issue?

Thank you

My control unit ,,, if someone has the same one I would like to buy it

The resistor on the bottom of this picture is always HOOOT to the touch ...


I opened the controller unit but its all completely closed with plastic epoxy i hope its a good one...


I dont know where the green wire should go. Its from the Pedal (GAS) switch not the throttle...

I cannot identify this thing I assume its like a relays ?




seems like a relays is missing here.



I dont know where the cables have to go ....