Hi I don't know if someone has this thread on here. But I have a 05 Silverado and batter keeps draining so have to unhook it at night. I have replaced alternator. And pulled relay for starter thinking it was that. I am at a lose anyone with any info will help thanks in advance

Well, first off, have you installed any accessories on the vehicle.....

I don't know if you have a glove box light, or underhood light, but have you checked?

You have to do a parasitic draw test.......

Have nothing on and key out of ignition....

disconnect neg battery cable.....

Now you need a jumper wire and an amp meter(set to highest amp reading)......

First attach jumper wire between neg bat terminal(installing a bolt into the bat terminal makes connection easier), and neg cable.....wait about 10 minutes.....

Now, attach your amp meter in parallel with the jumper(on, and at highest amp setting).....

Now remove the jumper wire......

The reason you do this with the jumper first, is to give the vehicle plenty of time, to put all modules to sleep..........then attaching the amp meter will give you a true reading...... if you don't do it this way, you will get a false initial reading.......

You should have a reading of 30 ma or less(0.030 Amps).......something like 2500ma(2.5A), is similar to a glove box light on.......

Now, you start pulling fuses one at a time and look for a dramatic drop in current(take out and then put back in if no change)....when you pull a fuse that creates a dramatic drop in current, this pinpoints PART OF THE CIRCUIT!, because this could have several circuits in parallel.....

Note: You may have more than one fuse block......if one is in the interior of the vehicle, you may need the door open....if this is the case, before you disconnect the battery, open the door, manually close the latch(if the latch has a door switch), and if it has an "A" pillar switch, you have to disable it......

There are plenty of parasitic draw demos on YouTube.....