loss of electrical power

[coon]

Looking for help, before I go mad. I have a 66 mustang, 200, 3.3L that I have had in storage since 1999. In 2001 I attempted to do start it up and at first it would not turn over. I attempted again and had absolutely nothing not a click or lights. I bought a new solenoid and it started immediately after I put it in. After letting it run for 15 minutes, I turned it off and tried to start it up again, and nothing. So now the car sat without running for almost 4 years.

I am doing work on the car once again and put in a new solenoid. The car wanted to turn over but it wouldn't. I pulled out the starter and the battery to have them tested. The mechanic said that they were both ok. I decided to rebuild the carbuerator, change the plugs, plug wires, distributor cap, and rotar to see if it would fire. I pushed the car back, when in neutral, to give myself room to work. I did the work, turned the key and got one click and lost my lights again. All wiring looks good and all connections were gone over including the addition of a new engine ground in hopes that that was the problem. I popped out the ignition switch. The switch looks fine but I am not sure what I am looking for. I am unsure if my car has a neutral safety switch, but I am wondering if this could be the problem since I pushed the car when in neutral and not running. It doesn't make sense to me that I would lose all my accessories and lights if it was the neutral safety switch.

Can anyone help me out on this one? What the heck could it be? Ignition Coil? Is the Ignition switch bad? I hate to get another solenoid just to start the car once to have to by another each time I want to start it. Any leads would be greatly appreciated.