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Old 08-24-2012, 07:13 PM   #1
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engine will not crank

im helping my neighbor. he has a 98 mountain aire 8.3 cummins. after a battery replacement we cannot get engine to turn over. when we turn the key nothing happensbut dash does light up and we have power everywhere else. we have checked voltage on the batteries and all read good. we have checked power with a voltmeter at stater solenoid and have power but starter will not engage. ive even resorted to pounding on it with a hammer to no avail. is there something we are missing? please help. thanks ,also not getting any lights on panel for the tranny

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Old 08-24-2012, 07:24 PM   #2
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It sounds like it may be a few things.
1 - Starter solenoid
2 - starter itself
3- neutral safety switch preventing unit from cranking.

CAn you hear solenoid click when trying to start engine. If so then it is the starter if no click then solenoid.

Make sure gear shift is in park because if not it will not start either. The newer vehicles require your foot also to be on the brake or nothing.

Hope this helps.

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Old 08-24-2012, 07:57 PM   #3
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thanks for the response tom we did suspect the solenoid but tried to remove the starter and was only successful in removing two of the bolts. the one i cant get is top inside between the starter and the motor. there are 2 cables that run between the two that make it hard to get an extension in there. as for the neutral safety switch like i mentioned not getting any lights on the push button panel for the transmission so have no idea if we are getiing power to it. any ideas?
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Old 08-24-2012, 08:03 PM   #4
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You can jumper across the start solenid or make or buy a remote start switch. That will take everything else out ou the equation at least. Then you can direct your attention to either the starter or the neutral start switch.
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Old 08-24-2012, 08:28 PM   #5
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ill give it a try 1st thing in the morning thanks
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Old 08-24-2012, 08:59 PM   #6
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You already have found the problem......You stated you did not have power to the tranny panel. That tranny panel also contains the transmission computer under it. If it is not powered then the neutral safety interlock will not allow the engine to start. Since you say you just replaced the batteries then most likely you either failed to hookup the transmission power lead to the positive battery terminal and it is laying loose or (and this is very common) the power wire from the battery to the transmission has a butt splice in the battery compartment which always goes bad. Most likely you accidentially disturbed it and it is now not making a good connection. Take a flashlight and follow some of the small red leads off the positive battery cable until you find that butt splice and redo it. You have to restore power to that transmission panel. Leave the starter alone until you get that power back and it still doesn't work.
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Old 08-25-2012, 12:46 PM   #7
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thanks mike the tranny power lead was not connected. i connected it and it fired right up. thanks to everyone who helped this is a great community.

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