Key & light buzzer

Wire said
. The only thing I have happening is with the key pushed in the ignition (not turned on) my radio works. (it has power). It stops working when I remove the key about halfway ( no power). Is my ignition switch bad?

Let me make sure I'm clear. You push the key in and do NOT turn and the radio works? You pull the key out and it stops? No that is not right.

Very first thing you need is the factory shop manual. Go to MyMopar which has a lot of info posted, including service manuals:

http://www.mymopar.com/index.php?pid=31

Something oft ignored is the section on service "master tech conference" here

http://www.mymopar.com/index.php?pid=117

If you select "browse by model year"

http://www.mymopar.com/index.php?pid=403

and scroll down to '70

http://www.mymopar.com/index.php?pid=427

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Something "new" that has been popping up there is a section on ONLY wiring out of the factory manuals, here. Save this

mymopar.com/downloads/1970/70_Dart_Challenger_Wiring_Full.pdf

In the above link, the Dart inst. panel stuff is long about page 17

The key-in buzzer is depicted on the far left side of page 15