Only 2 Diodes Light Up on 10 Diode LED Lights
Question:
I changed the taillights on my older utility trailer to 6inch oval 10 diode LED lights. When first checking, only the top and bottom diode lit and they were weak. I cleaned up all the grounds and rechecked. I still only have the top and bottom diodes on both lights but they are stronger. Why are not all of the diodes lighting up?
asked by: Paul
Expert Reply:
Checking all of the grounds like you have already done is the first step, including the main ground on the trailer and the vehicle's trailer connector ground. It is a good idea to check all of the trailer wiring for any damaged or frayed wiring because there may be a short in the wiring. I would ground the taillights to a trailer battery and touch the wires to the positive post to see if each light illuminates properly. You also want to make sure the connector on the trailer side and vehicle side is free of corrosion or bent pins. Also check that they are seated together properly.
If the functions on the lights illuminate properly then you know the issue is not with the lights themselves. If you test for function and the lights do not properly illuminate, then the taillights may be defective. It also could be related to your tow vehicle's wiring. You want to test the functions of the trailer wiring on the vehicle for power using a circuit tester like part # PTW2993. Specifically check the running light circuit on the vehicle's trailer connector for power. If you are getting power to the circuits on the vehicle's wiring, then you know that the issue is on the trailer side. If you check the functions on the vehicle wiring, you do not get power then you may need to replace your trailer connector.
Products Referenced in This Question
Product Page this Question was Asked From
- Trailer Wiring
- Trailer Connectors
- Trailer End Connector
- 0 - 5 Feet Long
- Plug and Lead
- 4 Flat
- Draw-Tite
more information >
Continue Researching
- Q&A: Does The Draw-Tite trailer Hitch Receiver Come With One Or Two Hitch Pin Holes
- Q&A: Replacement Hub and Drum Assemblies for AL/KO 8460 Hubs and Drums
- Q&A: Replacement Zerk Fitting Recommendation for Dexter EZ Lube Spindle
- Article: Trailer Wiring Diagrams
- Q&A: Can 12 Volt Accessory Circuit of Trailer Wiring Keep 10 Amp Breakaway Battery Topped Off
- Q&A: Can You Install a 5th Wheel Hitch On a 2021 GMC Sierra 2500
- Q&A: 4-Way Trailer Connector that has 5 Wires
- Article: How to Measure for Trailer Hitch Drop
- Article: How to Measure for Travel Trailer and Fifth Wheel Steps
- Q&A: Distance from Pin Hole Center to End of Bar on Reese Weight Distribution Shank RP63971
- Article: Trailer Tire Sizing
- Article: Brake Controller Installation: Starting from Scratch
- Article: Towing a Trailer? Let's Talk About Brake Controllers
- Article: Troubleshooting 4 and 5-Way Wiring Installations