Join Date: Aug 2009
Location: Eagle Mtn, Utah
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First off.... New or remanufactured alternator? Pep-boys/Autozone/Checker alternators all rebuild/reman the alternators, very rare to get a "Brand New" one from them. Just cant beat the warranty, but as all reman parts, they can fail. Dont get me started on how many starters I replaced in my 6.0's but lets say that I can do it in 15 min on my back in the middle of a parking lot with the 3 needed wrenches that always remain in the glovebox till I sold the trucks.
I concur with replacing batteries at the same time, but If I am not mistaken a flashing light for the battery is a sign that the charging system is failing and most likely your newly purchased alternator failed. I had to replace my alternator on my F-550's every 6 months on the average and batteries annualy. I did the AutoZone "Free Lifetime warranty" for the alternators and the Premium batteries with a 3 year free replacement warranty because it never hit my wallet again after that. Far better to cry once then several times to save a few $$$.
My reccomendation- clean all 4 terminals/posts very well, get the red/green anti corrosive doughnuts for the posts, get the red spray coating to protect the terminals from corrosion, Replace the other battery.. take the alternator back and exchange it and inspect the fan belt for all the little cracks that show its age...If needed replace as well.
Far better to cry once then several times because you wanted to save a buck.
2002 EXCURSION - 7.3 Turbo, 6" Lift, 35" BFG's, Stage 2 Intake, 3.5" DP to a 4" MBRP No Cat/DPF- Strait Piped- w/ 5" Tip, Locked F/R, and much more to come!!