Designed so that one person can make sure a vehicle wiring harness has been wired properly and all functions are working. Tests all tow vehicle functions: ground, auxiliary power, brake, directional and backup. Works only with 12 volt negative ground systems.
Features
Features
- Adapts to 4-Wire flat, 6-Round Pole or 7-Way RV Flat Pin
- Heavy-Duty, 20 foot extension cord is included
- Saves time and the cost of a second person at the rear of the vehicle
- Main Test Unit
- 4-Flat tester
- 6 Round adapter (center pin electric brakes)
- 7-Way RV Adapter and storage case
- Trailer Doctor (Trailer Side) - LM-50928
Installation kit
An installation kit is needed for proper installation on your vehicle
Installion Kit Available
Choose your vehicle
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