1988 Ford F150 starting problems?

I came outside a week ago and it wouldn't start. Something is draining a lot of power I know. Sometimes it will buzz when I try to start it and other times it won't do anything. Since first discovering I have done the following. Replaced the starter, replaced battery and both battery cables. A little bit ago I ran the negative cable directly to the starter hoping to get a better ground and still not working. Any ideas?

Here's the main problem, If you look on the front of the truck, It will say "FORD". Basically, Ford stands for: ****** Only Rolls Downhill. Hope this helped!

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