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99 xj classic 4.0 bad starter/alternator symptom ?

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Old 10-24-2020, 03:55 PM
  #16  
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Originally Posted by lawsoncl
There are a couple of starter solenoid designs, I don't recall which the 99 used. One design has the solenoid extending the shaft and then making electrical contact to power the motor. In another design, the solenoid just makes the electrical contact to power the motor, and it's the rotation of the motor that forces the shaft forward to engage the flywheel as Sig220 described.

The best way to troubleshoot is to measure the voltage at the solenoid while trying to crank. If you don't see voltage to the solenoid to activate it, then look upstream at things like the NSS switch, starter relay or ignition switch.
Its as if I had both things go at once . Starter went bad at exactly the same time the park neutral switch went bad ?? It seems unlikely to me . After replacing the starter however I can get the car to start which it definitely would not start with it's old starter . Just seems odd to me , hasn't been off-road for the past month or two , hasn't been through a puddle to potentially mess up some electronics . Hahaha.im ranting on now . I appreciate everyones help, I may just look into making a push to start button to bypass whatever switch is giving me a headache
Old 10-24-2020, 05:51 PM
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Do you have a voltmeter or test light to aid in troubleshooting? Are you getting power to the solenoid trigger wire? If not, I would start by measuring at the starter relay in the power distribution center. Voltage to trigger the relay comes from the ignition switch, and the ground is through the NSS.

Also, check this video about jumping with a screwdriver. If you jump the wrong two, it'll spin the motor but not engage with the flywheel.

Usually if it's the NSS, wiggling the starter or trying in neutral help. Here's a video on how to bypass it for testing.

And a video on fixing the NSS.
Old 10-25-2020, 12:26 AM
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Originally Posted by lawsoncl
Do you have a voltmeter or test light to aid in troubleshooting? Are you getting power to the solenoid trigger wire? If not, I would start by measuring at the starter relay in the power distribution center. Voltage to trigger the relay comes from the ignition switch, and the ground is through the NSS.

Also, check this video about jumping with a screwdriver. If you jump the wrong two, it'll spin the motor but not engage with the flywheel.
https://www.youtube.com/watch?v=fpPOcO6f798

Usually if it's the NSS, wiggling the starter or trying in neutral help. Here's a video on how to bypass it for testing.
https://www.youtube.com/watch?v=UqCvJ4IWNQI

And a video on fixing the NSS.
https://www.youtube.com/watch?v=70m0Pu6ZJ_0
Those are very useful videos , attempted to bypass the neutral switch , to no avail . So I think it must be the ignition switch . I know for fact my old starter was done for, because when I pulled it out and tested it with my jump box it did the same spinning motion and sound without pushing the actual gear forward--edit assuming it is ignition switch based on you saying the neutral safety gets spark from the ignition switch . Makes sense to me . I'm going to make her a push to start I think .
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