Wiring, relay, and circuit-breaker capacity are crucial to proper and safe electrical-system function. When you look at your Mustang’s electrical system like a fuel or plumbing system, it makes ...

Red, amber and green LEDs show the charging status for each battery. If a red fault LED illuminates, it indicates a loose wiring connection, reverse polarity, or DC over- or under-voltage for one of ...

Diagnose electrical problems by chasing voltage drops, instead of the old-fashioned way -- checking continuity. Including Mike Allen's Physics 101 introduction to Ohm's law.