That is your starter relay and if I'm reading the schematic correctly the red with blue stripe wire goes to your power distribution box in your engine compartment.
poor battery cable connection
It is located on the passenger side fender firewall behind the battery.
you need to replace the starter solenoid usually on a ford the solenoid is located on the side of the engine bay
The starter relay ( solenoid ) is mounted near the battery on the inside of the drivers side fender
It will cost approximately $60 to replace a solenoid in your Ford Explorer. The exact cost is dependent upon which solenoid is to be replaced.
It is bolted to the side of the engine compartment immediately below the hood. It will be on the same side as your battery. Just trace the positive (red) cable from the battery directly to the solenoid.
on the bottom of the transmission
On the inside of the fender just behind the battery. It has two cables attached to lugs, and a small wire at the bottom that is pressed on to a stud.
Starter solenoid? Follow the + battery cable will connect to starter solenoid One large cable from battery One large cable to starter One small "trigger" wire located in middle of other 2 cables Usually mounted to the inner fender
The starter solenoid is mounted directly to the starter.
Follow the + battery cable should connect to the starter solenoid (relay) either at the top of starter or at the inner fender perhaps under battery
I have a Motorcraft ( BXT65 - 650 ) Fords top of the line battery for the 1998 Ford Explorer