It wouldn't hurt to check your grounds.
Here is a list of grounds for a '92 - '96 bronc
I took a look in my Haynes manual.
They list 10 separate grounds... A-J.
A. Starter mounting bolt
B. Right front of Engine compartment near the battery
C. Lower left front of engine
D. Right front of engine compartment on upper radiator support.
E. Left front of engine compartment Upper radiator support
F. Bottom of cowl panel
G. Rear of left fender apron
H. Behind bottom of right cowl panel
I. Left rear corner of cargo area near rear lamp assembly
J. Under center rear of vehicle on rear cross member.
Ground number and locations in 1990 Bronco EVTM
G100 LH side of Radiator support
G101 RH side of Radiator support
G102 RH side of Radiator support
G103 LH rear side of engine, near knock sensor
G104 LH rear side of engine compartment, near electronic engine control (EEC) module, on the left fender close to the firewall
G105 LH Side of engine
G106 RH fender apron, near voltage regulator
G107 RH fender apron, at starter relay
G108 RH fender apron, at voltage regulator
G109 RH fender apron
G201 LH rear side of I/P (looking at the diagram it is at the bottom of the driver's side dash assembly. Screwed to the bottom edge, just to the left of the steering column. It is the ground for the instrument cluster)
G202 Behind RH cowl panel
G203 RH rear side of radiator support
G204 On steering column
G205 Behind Center of I/P (Dash), near speed control amplifier
G400 LH side of cargo area, near rear light assembly
G401 Below LH side of cargo area, near crossmember
G500 Inside driver's door, near left door speaker