gen light stays on with my key out

my gen light stays on even with the ignition locked and key out.

I replaced a battery in April , and it de-charged it so it will wu\ not take a charge.

New battery but light still remains on. Is there a short , I think so . Likely where to look, any clues ?

thanks

 

Take the positive wire off the battery post and put a volt meter in the line from the post to the clamp. Are you reading 12 volts? Sounds like you have a regulator with the "field" points welded together. JMHO... (that battery may be under warranty; dont mention charging issues!) ws

 

I bet the lock cylinder is turned back
Put the key in it and turn untill light is off
Cheap lock cylinders
My dad's is the same way

 

or a bad diode in the alternator

 

my key lock cylinder is kinda jankey.

will a bad diode in the alternator show up on a test at the auto parts store ?

thanks for all responses.

 

Yea a bad diode in alternate will cause the light to stay on. But I had to replace voltage regulator for the light to go out.

 

That was my thought too.

 

X3 Bad diode was my cause as well.