sounds like you have connected the wires wrong on starter. if that is not the problem then you have a short either in ignitin switch or in the solenoid
It would help to know what model and year vehicle you have but my guess would be the starter solenoid is stuck on.
Stuck ignition switch.
Wires connected to the starter incorrectly or defective ignition switch.
Sounds like your battery was weak to start with. What you did should not have caused any problems if your battery was in good condition so without seeing it, I think you should remove your battery and have your battery charged and load tested.
It may not be connected right.
Dead battery, Alternator not charging, Ignition off draw draining battery,.............
If it were the ignition switch, the vehicle would not start even with a jump. The battery is either not holding a charge or the alternator is not providing the charge to the battery. You can have the battery and the alternator checked (usually free of charge) at an auto parts store,
Wires connected to the starter incorrectly or defective ignition switch.
No, if it starts on its own without you turning the ignition switch then the ignition switch is defective.
No. If the starter turns over the ignition switch is good.
The right wires will have to be connected. You will need a wiring diagram to figure out the order.
once a battery is connected even if the key is not in the ignition, there is always power at certain points in your car. Connecting a battery backwards will not start your car, but it can and will fry the wires to your starter.
Try replacing the ignition solenoid. It sounds like yours may be stuck in the start position.
Engine ground can find many paths to the battery, but if NOTHING is connected to the negative post... no, it won't start.
I forgot to tell you after you connect the battery with the key in start position try to start the car after you reconnect the battery
Sounds like your battery was weak to start with. What you did should not have caused any problems if your battery was in good condition so without seeing it, I think you should remove your battery and have your battery charged and load tested.
It may not be connected right.
You do not need an isolater, but it is reccomended as without one you can drain your battery connected to your starter (your vehicle won't start). I do not run an isolater, just don't leave your accessories running and the battery won't drain.
battery may not be the problem check your starter motor and ignition switch