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How can I tell if it's the battery or altenator?

How can I tell if it's the battery or altenator on my Renault Master Van that's causing the battery & Stop light on the dashboard to flicker on/off? Thanks for your help.
Martin., May 2008
start it....disconnect batt cable...should run down if alt problem....OR...use charger to see what % batt reads---some also have alt testers built in...AND...could just be loose or old sending unit since it's flickering

joey, May 2008
link Click here to see other fixes for Renault Master.