Hey I've looked back almost to the first of the year thru all the threads and I didn't find something exactly similar.
I have 2 Chilton's and neither has the proper year wiring diagrams for my V6 4.3l vortec. Anyway, the battery will drain usually over a day if I don't use it, and if I use it every day, usually about once a week the battery goes dead. It reads 12.6 - 12.8V at rest and running it will read 14.3 or so. One year old alternator and 3 year old battery.
I pulled each fuse out and tested every fuse slot; everything was "0" with door open except #10 "crtsy loop" and #15 "rdo batt" which both read over 12v. I even slid a small wire into each slot with the fuse in and closed the door and they both read the same.
Nowhere can I find out what those two slots are, though by the letters they look kinda like courtesy loop and radio/battery?
How do I check a relay in the lighting system or any place? I need the wiring diagrams.
Also, can't find anywhere what the "key off" electrical drain should be.
If some one could lead me to the current/proper diagrams for a 99 4WD Blazer. I've been out of work for nearly a year full-time so money is tight and I can fix gas and pellet stove electrical problems but not this. Frustrating! Thanx.