Final answer:
The last step after connecting and installing a new 4-way flat connector is to test the connection, secure the connector and any loose wires, and protect them from moisture or damage.
Step-by-step explanation:
The last step after connecting and installing a new 4-way flat connector is to test the connection to ensure it is working properly. Testing the connection involves plugging the connector into a towing vehicle and using a test light or multimeter to check for proper function.
For example, in a 4-way flat connector, the pins correspond to specific functions: the white wire is for the ground, the brown wire is for the tail lights, the yellow wire is for the left turn signal, and the green wire is for the right turn signal. Testing the connection involves checking if each pin is receiving the correct signal when the corresponding function is activated on the towing vehicle.
Once the connection passes the testing, the last step is to secure the connector and any loose wires with electrical tape or wire connectors to ensure they are stable and protected from moisture or damage.