Car not jump-start

If the car will not jump-start, first also verify that the red cable from the battery to the starter is strong. If this cable is solid and connected firmly, either your starter/solenoid is bad or your start circuitry is bad.There
are various starter/solenoid designs here, but in most cases the
solenoid serves both to engage the starter gear to the engine
flexplate/flywheel and to close the