1989 Bronco won't start
- Thread starter rd848
- Start date
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yo rd,
WELCOME!
Can you get radio and other accessories to work when turning key to accessory position?
"...First thing to check is wiring. Between the large posts of your starter relay should be a smaller post with a wire attached Red/Lt Blu. This is the wire from your ignition switch through the clutch safety switch on a manual trans, or Park/Neutral position switch (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.
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 or a bad starter. Check to see if the 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 Red/Lt Blu wire, 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 located..."
by BigUgly88EB and ElKabong
MIESK5 EDIT; changed a few terms
Starting Sys stem Wiring Diagram in an 89
click thumbnail pic to enlarge in seperate window
Source: by Cucamongan (Scotty) at http://www.supermotors.net/registry/media/563340
WELCOME!
Can you get radio and other accessories to work when turning key to accessory position?
"...First thing to check is wiring. Between the large posts of your starter relay should be a smaller post with a wire attached Red/Lt Blu. This is the wire from your ignition switch through the clutch safety switch on a manual trans, or Park/Neutral position switch (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.
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 or a bad starter. Check to see if the 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 Red/Lt Blu wire, 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 located..."
by BigUgly88EB and ElKabong
MIESK5 EDIT; changed a few terms
Starting Sys stem Wiring Diagram in an 89
click thumbnail pic to enlarge in seperate window
Source: by Cucamongan (Scotty) at http://www.supermotors.net/registry/media/563340
