I a working on a 1996 GMC Jimmy for a friend and I have not had any luck tracking down a 150mA parasitic drain on the CTSY Circuit. If I remove the CTSY Fuse the current draw goes down to 10mA. CTSY is fuse 2 on the interior fuse panel. The Battery will not last more than couple days sitting.

Here is what I have done so far with no progress.

Removed TCC Computer. (Behind Ashtray)
Unplugged Large harness going into the transfer case.
Unplugged BCM
Unplugged headlight switch. (Actually unplugged All switches in the bezel and removed it)
Unplugged Power window switch on both doors.
Unplugged instrument cluster
Removed overhead console.
Removed interior under dash lamps.
Removed butchered car stereo. (Harness was put together with wire nuts and several wires were exposed) I cleaned all the ends up and made sure they could not short out.
Removed Cigarette Lighter.

I have been looking at these diagrams from another post and do not see what else to try.

The Battery is brand new and he had it tested to make sure it is good.

 

I think I just found it... I found an actual list of the items in the circuit and found something I had not looked at. The Sunshade mirror lamp was stuck on. The switch does not open when you close the visor.

Here is the list just anyone finds this helpful

2 20 Amps CTSY

Cargo Lamp.
Cigarette Lighter.
Console Courtesy Lamp -LF and RF.
Dome Lamp.
Driver's Information Display Center.
Endgate Lock Switch.
Horn Relay.
J/P Compartment Lamp.
Inside Rearview Mirror.
Interior Lamps Control Module.
Liftgate Lock Switch.
Outside Remote Control Rear View Mirror Switch.
Remote Control Door Lock Receiver.
Sunshade Mirror Lamp -LH and RH.

 

Nice job hunting it down. This can be very annoying if your not good at it

 

It can be very annoying even if you are good at it. I have been an electronics tech for 30 years. And still there are those days.

Hopefully this information will help someone else.

And why didn't GM put those on the timed shut off circuit like the rest of the interior lights. What were they thinking.