Try to hook up the battery and it sparks badly, no power, loom is good. What's going on?

 

Check all grounds

 

I did. Everything is exactly how it was when I pulled the original motor.

 

My friends Mitsubishi did this once. Stick the terminals on there an run. Haha that's wut we did. But we didn't swap anything on his car.

 

Mines a ford btw lol. I need my truck to be running and I don't understand what's going on. I can fix just about anything mechanically, but electricity I go full retard. The answer could be right in front of me but I won't see it. I took the loom back out to check for broken wires, etc, even plugged it into battery while out to see if it would spark (short) no spark. One wierd thing tho is I hooked the battery to the charger and the charge steadily dropped. I don't know if this is my battery or the charger as its older than me.

 

Never Go full retard.

Unhook everything. Then go back and hook everything back up. taking special not of the Grounds and Positive Accessory. (That's the small red wire off the Large red wire.)

Make sure you didn't attach your starter Powerwire to a ground. ..or that it's hanging down below arching on the frame or something.

 

Well older **** tends to be the better **** than the tools we have now a days...
Sounds like a bad ground..which could be anywhere, or a short...
My friends car did do this..one day we jus unplugged the terminals to clean them, and when we put the negative back on a constant shower of sparks came just every time it made contact. Haha it was awesome. Something else that could cause that is a ground crossed with the positive..
Are you sure you did the wires correctly? Bolted them back to where they're supposed to be? No part of the positive touches a place were it could ground off at? Inspect the solenoid too..the wires that hook to it, might have those wrong

 

Even the starter could be hooked up wrog

 

Are you hooking it up backwards? Also check your alternator hookup and starter hookup. If you have one of those hooked to ground it would cause this. They are probably the 2 largest gauge wires in the loom and come essentially straight from the positive terminal.

Somehow either your ground circuit (the body) is shorted to power or your power circuit (key off, which would only really be the starter or alternator) is shorted to ground. Also you could be hooking the battery up backwards. Perhaps pull it out and have it checked at advance auto parts or autozone. I think just about any place tests for free any more. Just to rule out the battery being bad since that weird issue with the charger...

 

Yeah..I wouldn't rate that as accurate, but it's better than nothin.
Once I had a bad battery, wouldn't take a charge. Would lose power over night or day, just over a long period.
I went to one of those places, and the guy said "let me test the battery before you buy a new one" he whipped out this massive *** ipad computer looking tester that was being rolled around on a tool cart, hooked it up to my terminals..told me my battery was good, and that I needed to change my alternator. I asked him why, he said because the battery checks out and the alternator made a whining noise, and tried sellin me off on that. Me being the noob I was then, I was confused on why my alternator was bad by his reasoning, but I still swore it was the battery. Left that place, went to auto zone, picked up a duralast. Went home, got my dads old school battery tester, the one that's all metal with a needle in it and a red yellow green gauge, tht had coils in it that heated up hotterna mother!38);&2er when u hit the test switch, ended up my Neverstart battery was bad, and wouldn't take a charge, my alternator was fine. I know now that there's a way to see if ur alternators good by using a meter but I didn't then. Still don't know if that guy was tryina rip me off on an alternator, or if his $5,000 battery tester was wrong. Either way, IMO old school tool wins and at the end of the day ill be doing my own work, or atleast diagnostics and decisions if its beyond me an someone else has to do it