Plymouth Will Not Start but will Crank
#2234284
01/14/17 10:38 PM
01/14/17 10:38 PM
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Joined: Mar 2005
Posts: 660
fury4speed
OP
mopar
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OP
mopar
Joined: Mar 2005
Posts: 660
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I had this problem before , it never really was fixed , here is what I know now , I installed a new reluctor , coil pick up , ingnition box , and finally a new ignition switch , cranks over but will not start , it has 12.5 volts to the starter relay but when cranking the voltage drops to 7.2 volts , it does not start , if you leave the ignition key in the start position and jump the starter lug on the starter relay and touch the terminal with the screw the engine starts , do you think it could be a bad starter relay? thanks.
Last edited by fury4speed; 01/14/17 10:39 PM.
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Re: Plymouth Will Not Start but will Crank
[Re: fury4speed]
#2234325
01/14/17 11:25 PM
01/14/17 11:25 PM
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Joined: Nov 2003
Posts: 36,040 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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but when cranking the voltage drops to 7.2 volts , it does not start Clean the bulkhead and the dangling connector under the steering column and or the connector on the ign sw and possibly more terminals/connections as needed to elim that excessive voltage drop. the battery is know to be good correct?
live every 24 hour block of time like it's your last day on earth
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Re: Plymouth Will Not Start but will Crank
[Re: fury4speed]
#2234340
01/14/17 11:42 PM
01/14/17 11:42 PM
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Joined: Jan 2003
Posts: 7,489 Minnesota
Hemi_Joel
master
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master
Joined: Jan 2003
Posts: 7,489
Minnesota
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Terminal N in the bulkhead connector is where the Dark Blue wire from "run" on the ignition switch feeds power thru to the ballast resistor. This is most likely where the fault lies. When the ignition switch is in the start position, it bypasses the ballast resistor and send 12v to the coil via the brown wire and terminal Q on the bulkhead. This is why it will run in the start position. Clean terminal N, or bypass the bulkhead connector by locating the dark blue wire on both sides of the firewall and tie them together with a separate wire thru a hole in the firewall.
[img]http://i.imgur.com/boeexFms.jpg[/img]31 Plymouth Coupe, 392 Hemi, T56 magnum RS23J71 RS27J77 RP23J71 RO23J71 WM21J8A I don't regret the things I've done. I only regret the things I didn't do. "Wise men talk because they have something to say; fools because they have to say something. ~ Plato"
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Re: Plymouth Will Not Start but will Crank
[Re: fury4speed]
#2234345
01/14/17 11:46 PM
01/14/17 11:46 PM
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Joined: Jan 2003
Posts: 7,489 Minnesota
Hemi_Joel
master
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master
Joined: Jan 2003
Posts: 7,489
Minnesota
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Was this a conversion to electronic ign? If so, did it ever work right?
[img]http://i.imgur.com/boeexFms.jpg[/img]31 Plymouth Coupe, 392 Hemi, T56 magnum RS23J71 RS27J77 RP23J71 RO23J71 WM21J8A I don't regret the things I've done. I only regret the things I didn't do. "Wise men talk because they have something to say; fools because they have to say something. ~ Plato"
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Re: Plymouth Will Not Start but will Crank
[Re: Daniel123456]
#2234455
01/15/17 02:43 AM
01/15/17 02:43 AM
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Joined: Nov 2003
Posts: 36,040 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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with more thought, what is the voltage at the yellow wire "ign" terminal on the starter relay when cranking? You might also jump 12V to that male yellow wire terminal at the exact same time a helper turns the key to crank. If it straightens out that would point to a voltage drop upstream in that yellow wire circuit. If not that would point to the SR recieving enough voltage and the prob is as you alluded to, the SR itself, poor continuity internally from the Batt stud over to the brown wire terminal when the yellow wire is energized.
live every 24 hour block of time like it's your last day on earth
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Re: Plymouth Will Not Start but will Crank
[Re: fury4speed]
#2234867
01/15/17 07:38 PM
01/15/17 07:38 PM
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Joined: Nov 2003
Posts: 36,040 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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I guess my old starter relay was bad? I hope it is finally fixed. (1) correct (2) I think you're squared away.
live every 24 hour block of time like it's your last day on earth
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