I was able to figure it out so I'll post the solution for anyone that may have the same problem in the future.
Essentially, the auxiliary hydraulics have a coil that goes over the stem. When you press a button on the handle to activate the hydraulics, it sends power which magnetizes the coil...
I have a 1999 873 F series. I've never used the aux hydraulics but recently got a backhoe attachment and can't get the aux to work.
Initially, the fuse was blown and the 2 green lights at the top right would not come on. I replaced the fuse and got the 2 lights to come on.
Then I tested the...