On a '94 4.0l you should have 2 wires coming off the positive battery post(if only 1 then it will be connected to same size wire on Relay post and that wire will go to starter motor)
Larger wire goes directly to the starter motor(in the older models there was a fender mounted solenoid, solenoid is now on the starter motor, relay is on the fender now)
Smaller wire goes to starter relay(on fender)
Starter relay is just used as power distribution point, not to power the starter motor.
Where the smaller battery wire connects to starter relay there should be several other wires also.
On the opposite post of relay there should be only 1 wire, a small black wire running down to starter solenoid on top of the starter motor, this activates solenoid on the starter motor but doesn't power the starter motor itself, that is done by the larger battery cable from positive terminal.
reads like your wiring got crossed up on the relay.
One post on the relay should have many wires connected, including smaller battery cable
other post on relay should just have 1 wire connected, the one going to starter solenoid on top of starter motor.
"S" post on relay(small post) should have small red/light blue stripe wire connected, that comes from key switch, via clutch pedal or Neutral switch.
This webpage has picture of the starter motor and the terminals: http://troubleshootmyvehicle.com/for...tarter-motor-1
Larger battery cable goes to Bat (+)
Smaller black wire from starter relay goes to S
On my 1994 the Red/blue stripe wire that was on the relays "S" post goes directly to S shown in picture