man do i need help

I have a 91 chev. caviler with a 3.1. parked it for a few months. now when I tryed to start it I get nothing. Checked the batt. its good. the only thing the will turn on is the headlights. dash board is dead, brake lights are dead turn the key and there is nothing. If there is anyone out there that can help or at least tell me where to start.

thanks
gumper
p.s. have checked the fuse box and the links and there all good

Ive seen this problem with a few cars and alot of the time the battery is perfect but the connections are corroded and not goving the car enough juice. If you can see some corrosion on the battery terminal just try cleaning it off with a wire brush.

have tried this and still nothing
still looking for the answer

The first thing I would do is r/r the battery with one You know works.
After that, it would be time to bring it into a shop and have them read the codes on the thing to diagnose it.

the prob is that there is nothing to read there is no power other than the lights and the horn there is just nothing

You may need to go thru and check all your wiring, I mean ALL. You may have had a mouse in there that chewed on something.

I had a similar problem on an olds 98 (still a GM) and found the cable from the battery to the starter had developed a high resistance to the point that it acted like a dead battery. I took a jumper cable from the hot lead on the starter to the hot side of the battery and it turned over. Replaced the cable and had no more problem. Being an electrician helped to keep me from making wiring errors like shorting the battery to ground and making lots of sparks.