you'd hafta determine what you did wrong, we can't see it, but you must have tied a hot wire straight to ground, maybe you had the alternator connections wrong .... and when you connected the last battery cable you should have seen a fat spark and immediately removed the cable to prevent melting things

Bill

Moved over to the Passing Lane

"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir
"When we tug a single thing on an old truck, we find it falls off" ~ me
Some TF series details & TF heater pics