Mount a Ford starter solenoid above the battery charge divider. They are built to withstand 800 amperes for 15 seconds. wire the relay base to chassis negative. Run a wire to s dash switch then to chassis battery positive. A shorted field coil will almost instantly fry a charge divider solenoid. How about having a ten dollar Ford solenoid laugh at an armature or field short while the charge divider solenoid stands back and watches the show? This is an extremely easy modification and it works like a charm. Fuse the Ford relay/solenoid for a 15 amp draw (inrush).
