I recently replaced my alternator and battery. I also repaired a faulty cable between the two. Now I'm having the problem of my battery going dead after a few days of it sitting and a lot of my fuses have power going to them what could be causing this?
Measure the current which is drained from battery when everything is turned off. Common multimeter with 10A fuse should handle this. If it is high current (higher than hundreds of mA), then something drains power and remains turned on even if it shouldn't. If the current is high, try to go through fuses one after one until you find the fuse with high current flowing through it. You can investigate further based on what it is.
If there is no drain, then measure voltage generated by alternator when engine is running. It should be something over 14V. If it gives less, it might be faulty.
In addition to the excellent suggestions to check for drains when the car is "off" and also that the alternator is producing the correct voltage when running I think this stands out:
I also repaired a faulty cable between the two
I'd be checking that cable out to make sure the repair is solid and that it isn't shorting or providing a poor connection.