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Take a lengthy wire connecting the ignition terminal of the isolator and run it down to the car interior near the steering column, test the ignition terminal with the 12 v test bulb, the light should turn on when the engine is on and should be in off state when the engine is off to ensure the connection is Double “J” Hook Ratchet Tie Down Strap established. Open the front hood and place the secondary battery in its corresponding tray using a 3/8 inch socket and ratchet. The wire connecting the battery and isolator are stripped and held in position using the 3/8 inch ratchet and socket. The negative terminal of the secondary battery is connected to the ground point on the frame using a gauge wire and is bolted on the either end to ensure connections, now the secondary battery will start charging only when the engine is on.