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PostPosted: Sat Aug 18, 2018 7:38 am 
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4 BBL ''Hyper-Pak''

Joined: Mon May 19, 2014 9:48 am
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About a month ago I got in the car (75 Dart) and it wouldn’t start. Swapped out ballast resistor and it fired right up. It happened again last night. Swapped out the ballast resistor but it didn’t work. Still getting lights and everything else- just won’t start. I’m now wondering if I have a shorted wire somewhere. Or if I should maybe check the voltage regulator. I did check the ballast resistor itself and it checked out fine on resistance. Any help is appreciated.

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PostPosted: Sat Aug 18, 2018 8:27 am 
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Location: Blacksburg, VA
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Is the starter cranking or not?

Lou

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PostPosted: Sat Aug 18, 2018 11:40 am 
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4 BBL ''Hyper-Pak''

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No it does not turn over.

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PostPosted: Sat Aug 18, 2018 11:46 am 
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Supercharged
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Location: Fircrest, WA
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Starter relay, neutral safety switch, shift linkage adjustment.

Try putting the car in neutral and see if it starts then.


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PostPosted: Sat Aug 18, 2018 1:19 pm 
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4 BBL ''Hyper-Pak''

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Wow. Yes. It started in neutral. What does that mean?

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PostPosted: Sat Aug 18, 2018 2:21 pm 
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Location: Blacksburg, VA
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Yep, that is why I asked. Thanks for the backup, Reed. The shifter can be adjusted, most likely. Or, for now you can wiggle it in P or N until it will crank.

Lou

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PostPosted: Sat Aug 18, 2018 3:12 pm 
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Supercharged
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Location: Fircrest, WA
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Starting in at least the early 60s, if not earlier, on automatic transmission vehicles Chrysler used a device called a "neutral safety switch", sometimes called the "neutral start switch," but in either case abbreviated "NSS," that only allows the starter motor to receive power when the transmission is in park or neutral. This was to prevent accidents if someone tried to start the car in gear.

The switch itself rides on a piece of metal, often referred to as the "rooster comb," inside the transmission. The rooster comb has a series of dimples on its edge and is the cause of the firm bumps/stops in the shift linkage you feel when you shift gears. Each bump is actually an indent in the edge of the rooster comb pressing against a spring loaded metal ball inside the transmission. There are additional bumps on the rooster comb that push on the NSS. The bump press on the NSS and allow the starter to engage when the transmission is in neutral or park.

The NSS can go bad or the shift linkage can gradually shift out of proper adjustment so the NSS in no longer engaged when the shifter indicates the transmission is in park. Before you spend the time and efort to get a new NSS and replace it, it is worth it to verify that the shift linkage is properly adjusted.


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PostPosted: Sun Aug 19, 2018 10:38 am 
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4 BBL ''Hyper-Pak''

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Many thanks for this info. I ordered the part. I noticed that if I shift the shifter a few times it starts in park.

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PostPosted: Tue Aug 21, 2018 2:47 pm 
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4 BBL ''Hyper-Pak''

Joined: Thu Aug 16, 2018 12:05 pm
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Location: Rosemead
Car Model*: 1964 Dart 225/A833 3.55 9:1 CR .473 lift 500AVS
I always ground out the neutral safety switch prong to the firewall, just to bypass that. But that's what i like.


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PostPosted: Thu Aug 23, 2018 10:04 pm 
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Turbo Slant 6
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Joined: Mon Jan 25, 2010 11:29 pm
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Location: Seattle, WA
Car Model*: 75 Dart SE (2),75 Swinger, 74 Dart Sport,91 Ram RV
We have run a bunch of 74,75,76 Darts, and had several neutral-safety switches worn out and be replaced. FYI

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"Louise", a 1976 Dart Custom project, (now sadly reverted to being just an "organ donor" to our other project Darts.)


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PostPosted: Fri Aug 24, 2018 4:38 am 
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Turbo Slant 6
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Joined: Mon Jan 12, 2015 5:55 am
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Location: Brightwood, VA
Car Model*: 1965 Plymouth Belvedere I
On old cars such as these, often the nylon bushings that hold the shifter rod in place will be worn, causing a sloppiness in the shifter, particularly with column shifted cars.

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http://www.MattmansMopars.com
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