Installing/Swapping New OEM Engine Fuse/Relay Box

[john_brandon]

I bought a used OEM engine relay/fuse box due to rear defog not working, but having a hard time finding details on the swap. I've found plenty info on acc fuse/relay installations but nothing on OEM replacement. Any help out there?

 

[RodrickHeffley]

I bought a used OEM engine relay/fuse box due to rear defog not working, but having a hard time finding details on the swap. I've found plenty info on acc fuse/relay installations but nothing on OEM replacement. Any help out there?

Are you sure it's the relay box and not the wires that go from the body to the hatch in the rear? That's normally the culprit when something in the hatch stops working.

 

[john_brandon]

Are you sure it's the relay box and not the wires that go from the body to the hatch in the rear? That's normally the culprit when something in the hatch stops working.

The rear wire harness is all good. Everything else in the rear works - window, lock, wiper. Checked the defog connections with the window, again all good. Heated mirrors also work, fuse for defogger is good but there’s no resistance at the defog relay. I’ve chased this problem for past two winters. Gotta be an issue in the box. I’m open to other ideas.