Unusual parasitic draw 05 GMC sierra 1500

[Christopher Moritz]

Sorry for a heck of a first post. I am having an issue diagnosing a .87 amp parasitic draw on my truck. I have pulled every fuse and relay one by one in both fuse panels. Also tested all the fuses with my Amp Hound. Checked every single bulb inside and out. Checked for warm/hot connectors, shorted/loose ground wires, and shorted connections (under truck, under dash, under hood). Also disconnected alternator to take diode draw out of the equation. Battery is good, used 2 different multimeters against my Fluke meter to make sure it was not my meter. And I even opened the door, locked the latch down (for dome light), pulled my instrument cluster plug, radio plug, pulled every bulb and out and let the truck set overnight. The battery is a 110 amp hour. It was at 12.62 volts when disconnected from solar charger. 18 hours later the battery was at 12.47 volts and still has a .87 amp draw.

 

I'm at my wits end trying to diagnose this draw. This will be the first time I have ever had to take a vehicle in for a mechanic to fix an electrical issue. I'm hoping one of the members here can give me some direction on what I might be missing. 

 

It's a Base model 2005 GMC Sierra 1500, 4.3 liter V6, 5 speed stick, no AC, manual roll up windows. 132,000 miles bare bones truck. 

 

Thank You

Chris

[sefiroxx]

You can also try disconnecting the main wire to the starter. It's not fuse controlled , connected directly to the battery.

Pull the main fuse, and relays as well.

Check the wiring for chewed wires.