The taillights, side marker and CAB lights are not working?

Hi,

The two fuses you mentioned won't have power until the trailer/park lamp relay is activated. The relay is under the hood. It will be a four-pin relay. I need you to remove the relay. On the relay, each pin will be numbered. Pins 85 and 86 are the primary side. Pins 87 and 30 are the secondary side. Using the relay as a guide, determine which connectors in the box match to numbers 30 and 86. Test if there is power present at those two connectors and let me know what you find. Also, let me know if this is a 2500. I am going off the 2500 wiring schematics.

Note: I did attach a couple of pics below. Pic 1 shows the relay/fuses and pic 2 shows the power supply to the relay. Additionally, here is a link you may find helpful:

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

Let me know what you find.

Take care,

Joe

See pics below.

Hi,

Thanks for the update. I'm glad you were able to resolve the issue. I had a feeling it may be related to the relay.

Regardless, take care of yourself, and feel free to come back anytime in the future.

Joe