Join Date: Dec 2010
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I’ve owned multiple 7.3s and a 6.0 and all of them need new battery’s about every 3 years. But I also don’t use optimum or other high price, in my opinion I just get Walmart brand cause they are cheap. When I had ficm problems, my battery’s would load test perfect at Walmart ( i believe it’s how they get out of warranty) but they would only crank the truck for about 10 seconds and would die.
Keep good battery’s in your truck cause it will take out the FICM , if they start to get low while cranking , don’t keep trying it, just bite the bullet and get new ones.
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