99 xj classic 4.0 bad starter/alternator symptom ?
#16
Newbie
Thread Starter
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.
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.
#17
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Year: 1989
Model: Comanche (MJ)
Engine: 4.0
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.
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.
#18
Newbie
Thread Starter
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
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
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