Karting02 said:
The silver box to the right of the back wheel below the last battery is what I believe is the transformer/ regulator and it is this which I don’t think is working.
I'm going to repeat what i asked before, that you have not yet answered. It is important if you want to get this working, without just spending money replacing parts that don't need to be (and that may not fix anything, or could even just be destroyed by the actual problem).
What specifically, and exactly, do you mean by "no longer working"? Does it smoke when connected, or burn on fire? Or does it do absolutely nothing, and draw no current from the batteries (assuming it's a controller) or provide no current to the batteries (assuming it's a charger)? Or does it draw current but not respond to throttle? Or what?
Depending on the fault, you could have a problem with the batteries, the throttle, the motor, the contorller, the wiring, the charger, or a combination of any or all of the above.
If you are certain it is this specific part, I recommend explaining what exactly you have tested, and how, to reach that certainty, so we can be sure tha't the right part to replace so it will all just work for you, rather than having further troubleshooting to do.
I'm also going to repost the battery wiring part, because you have not replied about that either, and it is also important to troubleshooting. The batteries appear to be wired in series in the pictures you've posted, rather than parallel, so I want to be sure that's still the way they are connected now that you are having the problem. If you have rewired them in parallel, you'll need to change them back to series for the system to work.
Karting02 said:
I have a kids electric go kart which was originally wired up to be charged with the power source (4 x RITAR RT12180 12V 18AH SLA battery (F13 Plug) SLA-RT12180F13) connected in parellel,
<snip>
(voltage: 48VDC, output 1000w)
If the batteries are all in parallel, then you only have 12v, not 48v.
Many (most) controllers have an LVC that prevents them from working at too low a voltage to prevent killing the batteries. So with only 12v, the system will not operate. You will need to rewire them to be in series to operate a 48v system.
I have opened it up to show you the circuit board.
Ok, that's definitely NOT a transformer or regulator.
It is a motor controller, the YK31CT according to the big letters on the PCB. Acording to google, it's for a brushed motor, and made by YIYUN, and comes up as YK31C (the T is probably just the board inside).
If you don't want to do any troubleshooting and just want to buy parts, you can get this same one at a number of places:
https://www.google.com/search?q=48v+yk31c&tbm=shop
Just make sure you get one that's for "48v" if you're going to run the four batteries in series. If you run them in 2s 2p (wiring the first two in parallel with each other, then the second two in parallel with each other, then the two parallel sets in series), then you need to get one that's for 24v.
So, is the motor itself a brushed motor? Or a brushless? (BLDC)
The former typically has only two wires going into it.
The latter typically has 3 fat ones and 5 or more skinny ones.
If you have the former, then it should work with that controller.
If you have the latter, it cannot work with that controller.
