Testing The Battery Backup Control Module

[rotorbill]

I have a 2005 Silverado 5.3L engine. While driving it last week, the Service Charging System DIC displayed along with a battery light. In a few miles the system degraded with all sorts of lights and beepers. I found the battery was low and charged it up. After startup, I checked the alternator and it showed a fault in both the load or no-load condition. Battery voltage holds at 12.4V. When starting up the vehicle voltage drops to 11.8 V and does not fluctuate. I pulled the alternator and have since found out that nobody can test it unless it is installed in the vehicle. Talking with a Chevy dealer, they said it could be either a bad alternator or the backup battery control module. Is there a way to test so that I can eliminate either of the two items as faulty? I cannot imagine that the alternator has gone bad with just over 28,000 miles on it, but you never know.

[VR021302]

Well you might wanna imagine it, unfortunately, with all electrical parts, they are very unpredictable. Ive had alts last for 8 yrs, or as little as a few months.

[DofD]

My money would be on the alternator has gone bad. You could put a new one in and if that isn't the problem, return it.

[VR021302]

My money would be on the alternator has gone bad. You could put a new one in and if that isn't the problem, return it.

 

 

Man u must have the hook-up. Cause where I am, we can't return electrical parts.

[Z71kris]

My money would be on the alternator has gone bad. You could put a new one in and if that isn't the problem, return it.

 

 

Man u must have the hook-up. Cause where I am, we can't return electrical parts.

 

Thats what I always get...but does Advanced Auto take anything back?