well went to turn on my car today, which hasnt been started since the summer and battery went dead on me. so i decided to jump it with my battery charger.
hooked it up the charger was making a weird noise but i figured it was just acting like that due to the cold. i proceeded to crank then sparks flew from the cables and car didnt start. after using the test light the battery had juice and then car wouldnt power up. then if i turned the key to ign. the chassis would have positive ground. i already cecked the mainrelay and nothing im stuck here guys. anyone had a simular problem ever?

thanks in advance