GM-GMC/battery keeps getting drained
Glen wrote at 2007-03-26 15:25:38
I had the same problem with my 1999 Sierra 3500 pickup [battery draining]. Some times it would drain very quickly (over night) and sometimes over a week or so.
I put an ammeter between the battery and the battery cable. It registered 800 milliamps. I understand it should not be more than about 50 to 100 when everything is off. This was apparently the cause of my SLOW drain.
I removed the under-the-hood light bulb and the courtesy-light fuse, since I had the hood up and the door open to get at the battery and fuse panel in the door hinge area. I started pulling fuses while watching the ammeter. Bingo! When I got to the RADIO-BATT fuse the ammeter went down to 60 milliamps from 800 milliamps.
I have no idea what the RADIO-BATT is, but the radio no longer plays with that fuse out. I can understand the wording RADIO fuse but not RADIO-BATT fuse.
I also found that the passenger-side front door courtesy-light switch was defective, sometimes allowing the courtesy lights to come on or stay on after leaving the vehicle (even after their 30 to 60 second time-out relay would normally shut them off). This 5 amp (5000 milliamp) drain was the cause or the QUICK drain.
HVLee wrote at 2007-10-16 17:25:12
I had the same problem on my 1997 S-10 Pickup. First, a four-year old battery went dead and tested bad at Auto-Zone. The replacement went dead overnight. The next one went dead over a weekend when I didn't drive the truck. After pulling the fuse for the interior lights and the bulb from the under-hood light, I put an ammeter on it and found a draw of about an amp. Pulling the "Radio-Batt" fuse, as you suggest, put the current draw in the normal range.
My radio still works, but it loses its memory when turned off. I guess that's what that fuse is for. It keeps the memory alive in the radio while the switch is off. Why it eventually becomes a current monster is a mystery to me.
MARK wrote at 2014-12-31 23:26:41
I HAVE A 1999 GMC, HAD THE SAME PROBLEM WITH MY BATTERY. DEAD BATTERY EVERY 3 WEEKS OF SITTING. AFTER PUTTTING IN A NEW BATTERY AFTER 3 WEEKS SITTING SAME THING. GAVE IN AND TOOK IT TO THE STEALERSHIP, $85 SAID I NEEDED A NEW BATTERY EVEN AFTER I EXPLAINED IT WAS A BRAND NEW BATTERY. ANOTHER NEW BATTERY 3 WEEKS LATER SAME DEAD BATTERY. TOOK BACK TO DEALER ANOTHER $85 IT WAS ONE THE THE SUNVISOR VANITY MIRROR FLAPS, THE HINGE BROKE AND THE VANITY LIGHT WAS STAYING ON. COULD NOT SEE IT DAY/NIGHT WITH SUN VISER UP. THAT DEALER WAS ONE OF THE LOCAL DEALS THAT LOST THEIR LISENCE 5-6 YEARS AGO. KARMA!