Removing my 05 f250’s (unfortunately had a hole above thermostat housing and by time I realized intake ingested water and hydro locked) mechanical controls , installing 08 f250’s with DEC. I was removing old harnesses and
I came across this single plug that was connected to the port motor and runs back to the battery switch (1/2/both/off). I’m kind of curious what the purpose of this plug was for and why it’s only hooked up to one motor and do I need it going forward with a newer install?
Any help is appreciated

I came across this single plug that was connected to the port motor and runs back to the battery switch (1/2/both/off). I’m kind of curious what the purpose of this plug was for and why it’s only hooked up to one motor and do I need it going forward with a newer install?
Any help is appreciated
