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I tried to attach photo but it won't accept it on the mobile app for this forum.

I'm wondering what the switch is that is attached to the power steering reservoir? Is it a battery cutoff switch? I purchased my vehicle used and don't know if it is stock or if the previous owner installed it himself.

It's got a lead from the switch to the positive side of the drivers side battery.
 

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There's no switch on the power steering pump on a 7.3L in an Excursion. I don't know about a 6.0L Ex, but suspect it would be the same.
Nothing stock would be wired directly to the battery terminal. Sounds like someone wired in some kind of level switch? because they had a leaky power steering system and it told them to add more ATF to the system before it totally destroyed the PS pump.
 
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