Why would a battery repeatedly drain of power in a 1995 GMC Sierra pickup?

[Bonezilla]

I have a 1995 GMC Sierra pickup that has always been reliable until last year when I started having problems keeping the battery charged. I have replaced the battery twice. Each time I replace it everything if fine for a few days but then the battery suddenly has lost its charge completely. I am wondering what might be causing this problem.

 

[Molson02536]

I have a 1995 GMC Sierra pickup that has always been reliable until last year when I started having problems keeping the battery charged. I have replaced the battery twice. Each time I replace it everything if fine for a few days but then the battery suddenly has lost its charge completely. I am wondering what might be causing this problem.

Bad relay to your fuel pump causing your fuel pump to keep running even though your ignition is turned off. Just to many things that can be causing your battery to drain, you can alway pull the fuel out of your panel one by one to localize where the draw is coming from.