My son-in-law and I worked on his Nissan Frontier, putting on a new alternator and battery that we purchased from Checker Auto. Everything worked great for about a week, when the same symptoms re-appeared, (dead battery & guages going haywire). After taking the alternator and battery back off and taking them to Checker for testing, Checker says their parts are fine (wrong). So now, since Checker denies bad parts, we take the truck to Firestone, believing that professional diagnostics is needed to trace down a grounding problem or... read full review »