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Have a 2004 ford f450 6.0l, wont start from igntion but will start from powering starter cannot diagnose why it wont start with key in ignition. Which wires are needed to bypass ignition switch
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Should it still start after bypassing the lock and using the igntion control module with a screwdriver?
Your best bet take it to a qualified repair shop !
Has the battery been load tested (Autozone tests free)? Are the battery cables free of corrosion? Has the starter solenoid been checked to see if the ignition start signal is present at the starter solenoid when the key is held in the crank position?
Check every switch,solinoid, and wires from the ignition connector to the starter, with a volt meter, follow the 12 volts from the start button to the starter to the battery. On a wild guess, the starter solinoid doesn't have 12 volts coming out of it when it is engauged.
First thing to check would be the starter solenoid-mounted on the starter. In the starting circuit, that is the most high use/high wear item. A tech would wait for the no start condition, then check the solenoid wire for power when key is held in the cranking position. If power is there, it indicates a faulty solenoid. If no power, trace the signal back to the ignition switch-from solenoid to starter relay to clutch switch to ignition switch. There are contact points (plates, really) inside the solenoid that become pitted and burned from use, and eventually wear down or out.
Did you check for power at the starter ignition terminal? It is the small YELLOW/BLACK wire on the starter. If there is power there, replace the starter. If there is no power there, you should check your starter relay an its associated fuses.
The relay primary side is protected by fuse number F2.31 (15 Amp) in the Central Junction Box. This fuse provides power to the clutch safety switch on the WHITE/PINK wire. Then the power leaves the clutch safety switch on the TAN/RED wire and goes to pin 86 on the relay.
The relay secondary side is protected by fuse number F2.113 (30 Amp) in the Central Junction Box. It provides power at pin 30 on the relay, which is also located in the Central Junction Box.
Pin 87 at the relay is the YELLOW/BLACK wire metioned earlier and goes to the starter motor. Pin 85 at the relay is the primary GROUND. This should be ground at all times.
The ENTIRE starting system can be checked/diagnosed from the pins at the starter relay if you use the correct methods and equipment.
Check the small wire going to the starter relay. It should have 12V when the ignition is in the start position. If it doesn't, you either have a bad igntion switch or a wiring problem from the switch to the relay. If you don't have a volt meter, you can use a 12V test light. Let me know if you need more help.
first check the battery make sure its fully charged then check fuses and relays then check startor motor and if it is not any of these it could be the igntion switch good luck
hi Jtdelta. What can cause the car not to start?
Because the battery controls your headlights and dashboard, if they turn on, but your engine won't start, a bad ignition switch is the likely culprit. 3. Broken Starter - Similar to a bad ignition switch, a broken starter is another common reason your car won'tstart.
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