New battery but something keeps draining it

how long does it take to drain the battery? If the starter relay is bad, it will prevent the starter from spinning or will keep it spinning. There is something else draining you battery. Try removing fuses one by one or groups and see which circuit is draining you battery. If it is a "new" car, remember that they have a slight current draw even if all appears to off there will still be a slight current draw.

IF you take it out and go to autozone or orielly etc they have a machine that can test it

IF you are saying that the starter motor is sluggish to turn over as if the batter is flat or low (6cylinder) then the problem is overheating of the starter. There is a shield that is available from ford to keep air flow around the starter. I found the answer to be a high performance starter (used for worked motors) as it is not affected by the heat.

Not common to your car in particular, but common.
Unhook your battery each night to keep from draining the battery whilst you search out the problem.
Put a test meter between the battery and the cable you took off to see how much of a short there is.
Some things that I have found were:
1) Some new replacement radios will drain a battery because they are on all the time, like most television sets today.
2) I have a car, (and have had a few more) that the glove box , (being plastic) was warped, and the glove box light stayed on all the time. I had to remove the bulb.
3) An alarm system, and some are factory built in, can drain a battery.
4) A trunk light, an under-the-hood light, or something else can do this.
Be blessed.

starter?
New battery drained = something is still powered, open/short.
new ign switch and steering won't lock = something was not put together right and the ignition is staying on and draining the battery.

Parasitic draw is what's happening . Have see instrument clusters cause this ,as well as module's not powering down . You need to do testing to find the problem . Watch these videos an test .
Diagnose Battery Drain Parasitic Draw Chevy Trailblazer
The Trainer 27 3 Ways Of Finding The Cause Of Key Off Battery Drain...

Fixing Stripped Threads With Helicoils can get them in any size just do whats in the video should fix starter motor from coming loose makes new bond.

if the batter has a drain the starter may be at fault the starter can drain a battery with out running i would unhook the battery cables then charge the battery then i would have the starter tested.

Well even a new battery can be drained down is you have something on all the time, in about an hour.

So start with checking for a drain.
Remove the battery cables in order to clean and grease them.
Then only put one on.
With everything off if you jump the gap of the cable that is off to the battery, with a test light, is should not light up. If it does, then you have a constant drain that will kill a batter over night.
You have to check for things like interior light, and disconnect everything, one at a time, to pin it down.

If you don't have a drain, then the next thing is to check continuity.
When you turn the ignition on, first the dash indicators come on.
The battery should read 12.5 volts.
Then you try to crank it.
The voltage should drop to 10 while cranking, and come back up after.
If it does not drop to 10, the starter is blocked and not drawing.
It could be the neutral safety switch, so try in neutral instead of park.
It could also be the ignition switch.
Use a test light to see of the small wire plugged into the starter solenoid (the small cylinder on top of the starter), get power when keyed to starter?
If it does not, then ignition switch or neutral safety switch.
If yes, then starter solenoid is probably bad.
But try turning the engine over at the alternator by hand or wrench, and try again. Could be binding between starter and drive plate.

Once you get it started, then rev the engine up and verify alternator goes over 14 volts, to recharge battery.
Otherwise battery will go dead in a day.

Is this the same problem that you before you replaced those parts? If not it sounds to me like you have a defective starter. If this is the same problem that you before then it could be, the neutral safety switch, the ignition switch, or the starter relay battery cables, poor ground. Check the negative cable connections at the frame, is it loose or corroded? The alternators job is to keep the battery charged, it doesn't have any affect on the starting system. The new battery should be fully charged.