yo,
Any voltagetarter relay on inner fender?
Check for voltage from ign sw to relay
http://www.broncolinks.com/gallery_images/Chassiswiring87-89Bronco.gif
No Start Troubleshooting;
"...First thing to check is wiring. Between the large posts of your starter relay ... should be a smaller post with a wire attached. This is the wire from your ignition switch that turns the starter over. 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 a park/neutral safety switch. If it's a stick, check the clutch switch.
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 (Or clutch safety switch on a manual trans, or MLPS on a 90 with an E4OD). There should be 12v running from the ignition switch, thru the safety switch, to the small terminal on the relay. Disconnect the small wire to the solenoid (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