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have a lith-ion battery for a wheelchair that wont take a charge. upon openin git I found that the black wire had come off, red wire is still attached. question is which lead does the black wire attsch to, there are 3 - 2 outer and one in center. the red wire is attached to an outer

Is it one of these?

https://www.google.com/search?rlz=1CAACAT_enGB772GB772&biw=1366&bih=666&tbm=isch&sa=1&ei=IUsyXJmiPOen1fAPyKC0kA8&q=electric+wheelchair+charger+socket&oq=electric+wheelchair+charger+socket&gs_l=img.3...199845.199845..203422...0.0..0.102.102.0j1......1....1..gws-wiz-img.a1fRuGQ_J6A

Or is it perhaps like one of these?

https://www.bitsbox.co.uk/index.php?main_page=index&cPath=225_232

Dimension 2.1/2.5mm relates to pin diameter.

looks mostly like the second page cn306 but I cant tell if there are 3 leads in back. but it is that style. I can send a picture if it helps

Thanks. CN306 includes an internal switch so it mighr be used to isolate the battery when charging.

Yes please, send a photo if possible. Also pics of chair, battery, maintenance manual if you can.

To send a pic you need to upload to another site like imgur and send a link, or zip and send via email.

Thinking about this, I suggest you do the following:

1. Ensure your black wire is adequately insulated/taped-off/separated. You don't want any possibility of short from black to anything.

2. With power OFF: use an ohmeter to see if plugging the charger in affects the ohms reading between the two outer pins.

3. If the reading is affected, these are the switched pins and black goes to the centre pin. You should see solder where it has broken. Carefully reconnect it with solder, avoiding any short to the other two pins. If this is too difficult, solder a short length of black wire to the centre pin and then connect this to the black wire. Insulate well.

Hope this helps. mike

Photos received, thankyou.

Please disregard above comment.