HELP!!! 2003 Sub. LOST NEED HELP

Ok everyone I need some help.
I have a 2003 suburban and as the truck sits could be overnight could be 20mins its dead. It is a hit and miss when it happens. I had in the shop they looked for a drain, NO DRAIN, I have replaced the Alternator, Starter & battery..

Still no luck went out to start it in the morning and it barely started. I had the Alternator tested all is good, I went and bought another battery last night. The positive terminal was getting hot. And now barely starts, I am open for help.

Thanks:runaround:

Be sure the battery cables are clean and tight on both ends of each cable, I would also check voltage drop on each cable when cranking. If voltage drop is more that 200 mV, replace the cable(s).

the battery connection is hot !!!!! could be also some other connection issue like what you have stated .. this means that cable lug connection is defective.. the heat is the resistance creating a hot spot.. this means low amps into OR out of the battery. I would first try to clean the connection .. ALSO if those connections or the wiring is GREEN replace this battery wire connector .. these are available at the auto stores and you may need to solder in the new wire connector into the existing OEM wire. this then you will need some solder a small torch and some heat shrink wire covering so as to prevent any exposure to the elements..