Function
1. Testing the Unit and the Connections
2. Using Illumination
3. Measuring DC Voltage
4. Polarity Test
5. Continuity Test
6. Activating Components out of the Vehicle's Electrical System
7. Testing Trailer Lamps and Connections
8. Activating Electrical Components
9. Jumper Lead Feature
10. Checking for Bad Ground Contacts
11. Following and Locating Short Circuits.