Blazer is a 96 with 4.3l

First off I think the batt is bad so I had it on the charger. Take it off and put it right in the truck
When I turned the key on for the first time I got some weird things happening. There was a loudish buzzing noise coming from behind/under the dash on the passenger side. The lights in the cluster were coming on..all of them the abs light, check engine, etc...
The rpm and speedo went up and down, were kind of bouncing I guess you could say.
Did that 2 or 3 times
Knew that wasn't right so I unplugged the batt to try and reset it, plugged it back in. Now when I turn the key on, none of that stuff happens. It's back to normal as far as the other stuff but when key is turned to start nothing happens at all. Headlights will turn on, dome and other accessories but when I turn the key absolutely nothing. No noises or clicks. Hooked up jumper cables and still get the same thing, nothing

I know it's long but any ideas would help a lot

 

can the battery be so bad, that even when getting jumped that it wont do anything?
I could hear the fuel pump before I unplugged the battery and hooked it back up, but now I can't

 

Maybe a bad battery cable?

 

hmm idk maybe.....have a new alternator coming in Thursday and new battery also so once I get those in I can see what happens

 

Checked the battery just now and it's sitting at 12.5 from when I was messing with it yesterday. Still nothing when the key is turned.
Not sure what it's called, but can the setup on the steering column that you put the key in and turn go out? Anything simple that I can check? All the fuses in the interior fuse box were good

going to dive into it more this weekend
Will check the starter connections

 

been doing a lot of searching and sounds like it could be the ignition switch...going to check it out and will report back

 

any ideas...gonna try and work on it this weekend?

tried getting to the iginition switch, but couldn't figure out how to take the lever off for the tilt wheel...to get the plastic trim around the column off

 

New alternator and battery fixed it....starts like a champ now
Guess one was bad

 

glad you got her fixed up.
sometimes if your stuck the tech section might be able to help ya out if its quite around here...happens from time to time.