Originally Posted by Eiron
Make sure your battery cables are all solid/intact, especially at the battery clamps. If you have broken wire strands at the clamps then that could be shortening the life of both the alternator & the battery. This happened on our '02 Focus wagon (went thru 2 batteries & 2 alts) & was only fixed after rebuilding the positive cable's battery clamp.
The alt-to-starter cable could also be a candidate for problems, but that cable doesn't usually see the amount of disconnecting that the battery cables do, so it's less likely to be a problem.
I have an 01 wagon and I'm getting this now. The Alternator went bad and then the battery so I replaced both, but now the light keeps coming on and it's getting annoying. Any ideas other than those stated? I took it to Orielly and...Alternator passes, battery passes, both are new within a week. This is killing me! Could it be a bad belt or bad tensioner? When I rev the engine it goes off Sometimes...Frustrating!
Thanks in advance!