Ford 1989 Bronco Owner's Manual page 233

WARNING: Always disconnect the battery before servicing high
current fuses.
WARNING: To reduce risk of electrical shock, always replace
the cover to the Power Distribution Box before reconnecting the
battery or refilling fluid reservoirs.
If your vehicle is equipped with an auxiliary battery,
disconnecting the primary under-hood battery DOES NOT remove
power from all circuits.
If the battery has been disconnected and reconnected, refer to the
Battery section of the Maintenance and Specifications chapter.
The high-current fuses are coded as follows.
Fuse/Relay Fuse Amp
Location
1 HC Micro Relay Powertrain control module (PCM)
2 HC Micro Relay Starter solenoid
3 HC Micro Relay Wiper
4 HC Micro Relay Trailer tow battery charge
5 HC Micro Relay Fuel pump
6 HC Micro Relay Trailer tow park lamp
7 HC Micro Relay Upfitter #4
2010 Econoline (eco)
Owners Guide, 3rd Printing
USA (fus)
Roadside Emergencies
Protected Circuits
Rating
233