yo 86,
WELCOME!
What do you mean by "or the starter hangs up":
does starter crank engine, then stops and hangs or buzzes?
or does starter just buzz or hum?
Here is the wiring diagram for 86 Bronco
http://www.revbase.com/BBBMotor/Wd/DownloadPdf?id=27271
Some non- Ford Motorcraft starter relays (mtd. on pass. side fender liner near batty) are bad out of the box.
Have you tried applying battery + voltage w/small jumper wire to the small stud on the relay where Red/Lt. Blue wire is attached??
No Start Troubleshooting; "...First thing to check is wiring. Between the large posts of your starter relay should be a smaller post with a Red/Lt. Blue wire attached. This is the wire from your ignition switch through the Park/Neutral Safety Switch (NSS)/Manual Lever Position Sensor (MLPS), Or clutch safety switch on a manual trans, or NSS/MLPS with an AOD/E4OD, to the starter relay and the on to the starter solenoid (if equipped) and starter. Check this wire for cracks, open insulation, or anything that could possibly cause an open circuit.
Next, check your upper ignition actuator. Find the ignition rod (on top of the column, running from the steering wheel down to the ignition switch at the base of the column) and make sure it's moving back and forth when you turn the key, through all positions. If it is, your upper actuator is probably not the problem. Lastly, check your ignition switch (again, at the base of the column). Manually push the switch back and forth through the different positions. Push it all the way forward (or down) and see if it will engage the starter. If it does, then your ignition rod is probably bent, which can be remedied quite easily. & If it's an auto, try starting in neutral or while pulling up on the lever while it's in park. If that works, look to the Park/NSS/MLPS. If it's a stick, check the clutch switch. You could try jumping from hot to the small terminal on the starter relay to test it's operation. Sometimes new ones are bad out of the box. If it won't turn over when jumped to the small terminal, you'll know that it's a starter relay issue (Bad part, bad ground (ground is thru rley body to inner fender) or a bad starter. Check to see if da relay is tight to inner fender with no corrosion because the relay's body is ground path via inner fender). If it does turns over jumped to the small terminal, then you'll be looking for something in the small circuit that includes the ignition switch & the park/neutral safety switch (NSS/MLPS) Or clutch safety switch. There should be 12v running from the ignition switch, thru the NSS/MLPS, to the small terminal on the starter relay. Disconnect the small wire to the starter relay (So it doesn't start by surprise, I'd pull the coil wire too). With someone holding the key in the start position, you should be able to read 12v between any point on that small circuit & ground. When you find where you lose 12v, then you'll know where the issue is..."; Source: by BigUgly88EB and ElKabong (Ken, El Kabong)
No Start Troubleshooting; "...If you can't start the Bronco from the key/cylinder it might be the "upper ignition actuator" has broken in it's track inside the steering wheel OR could be just the key cylinder itself which "pops out" if you look right under it on the metal column collar, there's a little slot and with the key turned to RUN -engine off push up inside with an appropriate tool and comes right out. You can start the vehicle from the "starter relay" under the hood, right inside fender area or pull off the "black plastic cosmetic column shroud" exposing a long 'ignition actuator ROD" and with the key turned to RUN using a set of pliers, drive the ignition actuator ROD downward/forward and the vehicle will start with most key functions intact....i.e, RUN/NO START, OFF/LOCK, AUX
by JKossarides ("The Bronco", Jean)
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