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I have a 2008 Ford Focus, and sometimes it starts, and sometimes it doesn't. I have replaced the battery, starter, relay and ignition switch. It happens more in the summer than winter, it doesn't make a sound when you turn the key but the lights and everything on the dash come on. With jumper cables it will start right up. What could the problem be?

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    Sounds like a possible voltage drop issue/high resistance in the wiring.
    – Ben
    Commented Jun 9, 2017 at 20:51

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Look for corrosion at your battery cables and especially at the starter connection, and all electrical grounds. Clean off the corrosion with a steel brush if you can, replace the ends and lengths of wires if the corrosion is too invasive.

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