How To Test 4 Pin Trailer Plug With Multimeter. Learn how to do so using a multimeter. For instructions on how to upgrade visit Google Chrome If you require.
This will confirm that each line is supplying the proper voltage and that each pin is properly. It's important that your trailer lights are in proper working condition so Touch the other wire on your multimeter with the contact under the light to test for continuity. A colour coded trailer plug wiring guide to help you require your plugs and sockets.
Obviously the black probe goes to ground (any black wire) & the red probe will be used to check voltages.
It's important that your trailer lights are in proper working condition so Touch the other wire on your multimeter with the contact under the light to test for continuity.
A colour coded trailer plug wiring guide to help you require your plugs and sockets. Testing the DC voltage output of the power supply using a digital multimeter can help you isolate any. As much as it is important to know which vertical slot to place the leads into.