Battery connected (opposite terminals) and then quickly disconnected. Now it seems it is not charging. What could happen?

Fully charged your battery should measure 12.6 volts or higher. So based on you data, your battery is a little weak. Not sure how old it is or what brand, but as the battery ages it weakens. I suggest you first make sure the terminals are freshly cleaned using a terminal cleaner and then take the vehicle it to any parts store and they will load test it for free. Good luck. Hope this helps

If it ISN'T cranking over ok ... and has a discharged battery..
Disconnect the leads from the rear of the alternator. A faulty alternator can discharge a battery within minutes. Charge the battery and leave the alternator disconnected. Try and start the car.

If - with a charged battery and alternator disconnected - the engine seems very slow to crank or makes a 'clicking' noise ... try cleaning the battery terminals - particularly where the black lead connects to the engine block/bodywork.

Check the leads -and terminals - for breakage/corrosion. A 'bad earth' or corroded/loose battery terminal can cause non-starting problems.

If all is ok and the car spins the engine but won't start, suspect a sensor fault.

Don't waste money on replacing part after part in the hope that the care will fire up. The best - and cheapest - option is to have an OBD - a hand held diagnostic check done. This will identify any error codes and tell you the cause .. i.e 'crankshaft sensor fault'.

You probably burned one or several of the main fuses or fuseable links that protect the major electrical circuits.

First of all, is alternator charging the battery. Battery voltage when engine is off, should be at least 12.6 or better at battery posts.less than 12.4 with engine off. Battery is going bad. When engine is running at battery should be at least 13.8 to 14.2 or more if alternator is charging. You can go to any auto parts store, and get the charging system checked for free Advanced auto, Auto-zone, ETC, Good-Day! if battery and alternator are good. Heres how to check for a current drain. Disconnect negative terminal from battery, Hook a test light to the negative cable. connect opposite end of test light to battery negative post . wait at least 5 minutes, with test light hooked up. if light is on. Then start pulling fuses in fuse box, when the light goes out. thats the problem circuit.

replace ignition switch.

Be sure to check that all connections are clean and free of build / contamination. Terminal to post, leads to terminal and if this is beyond that, check the "-" lead contact / connect at the opposite end - should be the frame or engine block. The majority of the time it will be at the battery, post to connect. You can find a very handy post / terminal wire brush tool at the local parts store for a few bucks. I dont normally suggest this but, Coka-Cola does actually work if you disconnect the terminals from the battery and pour over each of the "contacting points". Hope this helps!

The same thing happen to my older bother years a go, He had to get a new battery , Hope fully you did not damage the computer on it buy useing a quick charger on it with out Disconnecting the battery cables from the battery, What happen with my bothers he was verry lucky that all it was that it damaged the battery becaused they tryed to boost it end got the neg & pos cables mixed up, That is a good way to damage the alternator plus the computer, The same goes when you are chargeing a battery end you don,t disconnect the cabes from it ,That can happen,

Any lights working, or is everything dead? If nothing is working, charge the battery if you have or can borrow a charger. If you have no access to a charger, pull the battery out and bring to a major parts store, most offer a free quick charge, and will test the battery to determine its' condition.
Did you disconnect the battery to install the starter? If not, did any live wires touch anything and spark? If this happened, something may be damaged in the cars electrical system.
Check the battery terminals to make sure the connections are clean and tight, and also make sure the starter wires are connected and tight. Let me know what you find when you check the above, I'll help further if needed.

hi
it sounds like the wire has been fitted for an aftermarket accessory. eg handsfree kit or somthing, doesnt seem to be original.
hope this helps

If you have an actual draw, you will need to get it to a shop to have them test for this. A draw test will quickly tell whether or not you have this problem. As far the battery going dead, always make sure you slow charge the battery and get it up before starting the vehicle and taking off with it. This will take a load off the alternator in that it will be working hard to try and recover the battery. Also, never jump start your LR from another running vehicle. The voltage regulators are very sensitive in these and are often blown out by this method. Make sure that the vehicle you are jumping from is off. Also, never charge the battery on engine start mod or it can do the same thing. Slow charge it or remove the terminals to do the quick charge.