Dakota98 wrote:
esox07 
    THE "SIMPLEST" BY FAR METHOD: USING THE NEGATIVE WIRE, CUT IT AT SOME POINT JUST OUTSIDE OF THE BATTERY BOX. DEPENDING UPON THE SIZE OF THAT WIRE GET AN INSULATED MALE & FEMALE BUTT CONNECTOR, STRIP THE ENDS OF THE WIRE & CRIMP THE NEW CONNECTORS ON. IT MAKES FOR A SIMPLE CONNECT / DISCONNECT
What happens when someone forgets to push those butt connectors together or if they oxidise and no longer offer a good connection? 
When you connect to your trailer and drive away, you have no emergency braking system since the (-) phase has been interrupted.