I'm going to go out on limb here and I hope I'm wrong!
Is it possible that the larger battery that you put in (bigger doesn't hurt a thing) has a different post configuration. ie neg. and pos. post are switched on the corners, and you have hooked it up backwards. Should be Black cable (ground) to the neg. (-) post and the Red cable to the pos. (+) post. And if you can't read the - or + signs for wear or grease, the pos. post is a larger diameter.
If you did, there are diodes in the fuse block that have burnt themselves up, and the problems may not only be confind to that, possible protection diode in the radio, instrument panel and pcm, and any place else that may have a diode that gets power when the key is turned on.
Lets hope this is not the case. But I had to ask?
Last edited by triumphman; 10-26-2004 at 10:14 PM.