Testing Trailer Lights And Connections - Forch 5439 172 Manual Del Usuario

Activating components out of the vehicle's electrical system
By using the Power Probe tip together with the auxiliary ground lead, components can be activated, thereby testing their
function. Connect the negative auxiliary clip to the negative terminal of the component being tested. Contact the probe to the
positive terminal of the component, the LED indicator should light GREEN indicating continuity through the component.
While keeping an eye on the green LED indicator, quickly depress and release the power switch forward (+). If the green
indicator changed instantly from GREEN to RED you may proceed with further activation. If the green indicator went off at that
instant or if the circuit breaker tripped, the Testing Device Switch has been overloaded. This could happen for the following
reasons:
- The contact is a direct ground or negative voltage.
- The component is short-circuited.
- The component is a high amperage component (i.e., starter motor).
If the circuit breaker is tripped, reset it by depressing the reset button.

Testing trailer lights and connections

Connect the Testing Device Switch to a good battery.
Clips the auxiliary ground clip to the trailer ground.
Probe the contacts at the jack and apply voltage to them. This lets you check the function and orientation of the trailer lights.
If the circuit breaker tripped, reset it by depressing the reset button.
Activate fuel pumps, magnetic clutches, starter solenoids,
cooling fans, blower motors, lights etc.
Contact the tip to
the positive
terminal of the
bulb
Press the power
switch
forward to activate
the blub
Connect the
negative auxiliary
clips