[Formulabruce]

Just because you have 12 volts, does NOT mean your
Battery is Good. You can have partial plate function in your battery while the rest of the plate is basically open, or semi shorted with corrosion. A battery 7 years old is ready to be replaced. Newer batteries do NOT have the warranty period as long as older batteries due to them putting in more plates, which are closer together. This gives more Amps, but will short out in a shorter period of time. Electric fans really make no difference if wired with big enough wire and your alternator can handle it. Typically fans will draw 20-30 Amps and most alternator are not fully "excited" and charging till around 1600 rpm. Obviously, as mentioned, clean contacts are a must. I have 2, 10 year old Delco batteries that measure 12.6 volts and only use them for testing circuits. or my power probe tool. Neither would ever start a car again.