[bytemaster]

Have a 2000 f350 7.3 super duty. The starter stayed engaged and I was unable to turn off the motor, although turning the ignition back to off, the starter stayed on. Ultimately the starter burned out and was shot. I replaced the starter and the ignition tumbler in the steering wheel. Work for a day then the starter again stayed engaged and did the same thing. I disconnected the batteries to shut the truck off, yes I know its bad but didn't want to burn up another starter. What is going on?

[FlyingMoose]

Since you've already replaced your starter and the ignition switch, you have one likely problem left. [links]

[awwright]

The starter circuit is typically quite simple. The high current wire goes from the battery to the starter motor. The ignition sends a signal to a relay so it closes and allows current to flow to the starter solenoid. The solenoid engages the starter motor teeth with the flywheel teeth, and simultaneously connects the high current power to the starter motor. On some Fords, like yours (from what I've read), the relay portion of the solenoid is separate from the starter. It is a small part on the passenger side of the car, and it gets the signal from the ignition instead of a smaller relay activating the solenoid on the starter. [links]

[tabshift]

The starter relay is a very durable and reliable mechanical part, however it is possible for damage to occur requiring a mechanic to replace the starter relay. If you notice any of these warning signs, make sure to contact one of the professional mechanics at YourMechanic.

[hilary33]

Most of today's modern cars and trucks have an electronic ignition switch that is activated by remote key. This key has an electronic chip embedded that links up with the computer on your vehicle and allows the ignition button to activate. There are times when this type of key will impact the operation of the starter relay and display similar warning signs as if this system is damaged.

[JosephT.Holt]

Listed below are a few of the symptoms of a damaged or worn out starter relay. If you notice these warning signs, make sure you contact a local ASE certified mechanic to completely inspect your vehicle as these symptoms might indicate problems with other components. more

[Daniel]

If the starter relay is working properly, it will send power to the starter every time it is engaged. However, it is possible that the starter relay will become damaged due to excessive heat, dirt, and debris or other issues that might cause sporadic operation of the starter. If you try to start your car and the starter doesn't activate instantly, but you turn the key switch once again and it works, this is most likely due to a problem with the relay. In this case, it's important that you contact a mechanic as soon as possible so they can determine what is causing the intermittent contact. In many cases an intermittent starting problem is linked to a bad wire connection that may become dirty due to exposure under the hood.

[Warz]

The most obvious warning sign that a problem with the starter relay exists is when the vehicle won't start when you engage the ignition process. As stated above, electronic keys do not have a manual ignition switch. However, when powered, it should send a signal to the starter relay once the key is turned or the starter button is pressed. If you press this button or if you turn the key on a manual ignition switch and the vehicle does not turn over, it may be caused by a problem with the starter relay. here

[komoto]

This symptom is common when your battery is low on amps, but is also an indicator that your starter relay is not sending a full signal. The relay is an all or nothing device, meaning that it either sends the full electrical current or sends nothing to the starter. However, there are some occasions when a damaged starter relay will cause the starter to make a clicking sound when you turn the key.

[Stobrawa]

To give a quick overview of the function of a starter motor, once the ignition switch is turned the driver is kicked out to engage your engines flywheel. Once the flywheel turns quick enough, it nudges the driver back into the starter motor and the starter motor shuts off.

[tashlan]

Check your ignition switch. You want to make sure that the power does not stay on once your ignition switch is released. This continuous power to the starter can cause it not to disengage. To make sure it’s not the solenoid; check the power on the posts behind the solenoid by testing the wire coming from the ignition switch, using a voltmeter. It should indicate zero. If it shows you have power, this may be the reason your solenoid is stay continuously engaged. The reason for this may be a bad switch or the cables may have a short. Please note that switches have been known to work intermittingly.

[bitcoinuser]

With that said, the first thing we would advise you to do is to make sure the starter motor is properly installed and lined up correctly within the engine. Check that all bolts are tightened. It should not be loose. Next, and also equally important, is to check and recheck your wiring. Are all cables tightened and in good condition? Chances are, especially with reinstallations, your wires are not where they need go or they are loose. It’s the most common mistake made and easily overlooked. more

[Maxalu]

Lastly, low voltage can also cause this issue. This may be due again to improper wiring, bad connections and a low or bad battery. If after trying these quick-fix solutions you still have the same issue, take your starter off and have it tested as it may be experiencing problems.

[hughbarnard]

Alternator?
Crossed wire on Slave?

[cb]

starter
Solenoid Assist ( slave)
points
Plugs
THe Coil

[AgentME]

well the new Solenoid slave doesn't have a S or a 1 and I ended up overtightening on one of the posts so lol I will be putting in my old one as I did end up replacing the starter so could that have caused the staying engaged bad old starter ? I did have iut checked at oreilly's and it failed