PTV 35/44/55/66 Installation Manual
Rev. 1.1
63
13.11
Trailer to Tractor Ground Test
D
A. 12V lead from tractor coil cord
B. Center (+) plug on front of trailer
C. Trailer Ground
D. Tractor chassis ground
+ - + -
C
B
B
+ - + -
B
D
D
A
C
Testing of full system using a battery load tester. Start with testing each individual battery on both tractors
and trailer before proceeding to check the system:
1. Tractor Test:
Ground battery load tester on tractor chassis point (D)
Connect positive load tester cable on positive pole of single pole plug at end of tractor coil cord (A)
Run load test- This will test entire circuit on tractor including ground
2. Trailer Test:
Ground battery load tester on trailer chassis point (C)
Connect positive cable on positive pole of single pole plug receptacle on trailer (B).
Run load test- This will test entire circuit on tractor including circuit breakers and ground
between trailer batteries and trailer chassis.
3. Tractor and Trailer Charging system test while connected:
Ground battery load tester on tractor chassis point (D)
Connect positive cable on positive pole of single pole plug receptacle on trailer (B).
Run load test- This will test entire circuit on tractor and trailer including ground between
tractor, trailer, and circuit breaker on trailer.
A simple low amp voltage test at the front of the trailer or at the tractor will not show insufficient connections
or ground problems.