Ford F-350 7.3 Glow plug relay replacement
Early 1999 7.3 Glow Plug relay testing and replacement.
The book calls for the Motorcraft DY861. https://amzn.to/35loaeq
But I used the Motorcraft DY860 that was $10 cheaper and came with new nuts and washers.
https://amzn.to/2XykAen