Who here has DIY'd your own Upfitter harness?

[Poor White Boy]

Its never ending with multiple super duty trucks and ordering needed upgraded upfitter items etc ..... seems like at least once a week see something else one of my trucks needs. I just order OTC

 

[trmrzla]

Anyone install one without removing the factory upfitter switch box? I really don’t want to have to go through the hassle of pulling the battery if I don’t have to.

I've seen a few people mention they have without removing it.