Put a new battery in a Gmc 1993 sierra truck; won't hold charge. Any idea why?
Check and clean all battery and frame/motor ground connections. Also check alternator voltage it should be charging at 14.5 volts. If all this checks out you might have a parasitic draw issue.
www.youtube.com/watch?v=KF1gijj03_0 --- here's how to test for parasitic draw
See if the radio clock stays on when you take the key out,thats what happened to my fathers truck
Looking for a Used Sierra in your area?
CarGurus has 31 nationwide Sierra listings and the tools to find you a great deal.
Search GMC Sierra Questions
Are you a UK consumer? CarGurus now has a discussion forum in the UK.
GMC Sierra Experts