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  5. Video 1327

This Old Trailer: Troubleshooting the Ground Wire Video

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Info for this part was:

Employee Cole B
Installed by:
Cole B
Employee Randy B
Installed by:
Randy B
Employee Zach D
Video by:
Zach D

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Products Featured in this Video


Combination Tail Light for Trailers Over 80" Wide - Submersible - 8 Function - Driver Side


Optronics Trailer Lights

39 reviews


Code: ST5RB

Retail: $22.56

Price:  $8.57
  • Trailer Lights
  • Tail Lights
  • Brake/Tail/Turn
  • License Plate
  • Marker
  • Square
  • Surface Mount
  • Submersible Lights
  • Incandescent Light
  • 6-1/8L x 4-9/16W Inch
  • Red
  • Optronics



6-1/8" x 4-9/16" Square. Waterproof, incandescent tail light serves 8 functions on trailers over 80" wide. Shock-proof sockets protect bulbs. Screw-on lens. Stud mount to trailer. Two wire design. (2) 1157 bulbs.


Do you have a question about part ST5RB?more information >     


Troubleshooting the Ground Wire Episode of This Old Trailer


The first thing you want to do when you first start working on electrical problems is you want to divide and conquer. You have two parts here, the truck and the trailer. You want to verify which one actually has the problem. Chances are it is going to be on the trailer, but then again you still want to check the truck too. So use a separate light tester, hook a ground not to the frame but to… see more >