wont run

Technical Question and Answer - On topic to 71-74 Plymouth B-bodies only.

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72plymouth
Satellite Coupe (RL)
Posts: 16
Joined: Sun Apr 19, 2015 5:39 pm
My Cars: 72 plymouth (clone) Road Runner

wont run

Post by 72plymouth » Tue Apr 21, 2015 7:08 pm

Ok I've put a new motor in my Road Runner and it has ran for 15min. I've started it up and it shuts off and same over and over! Its getting gas and is in time.......... whats funny this car has no points and has a electronic ignition with new distributor. Tried again fires up then shuts off fires up then shuts off..... very confusing and idea's? :mad: Any help would be much appreciated!
Attachments
IMG_8901 (478x640).jpg

71Satellite98661
GTX (RS)
Posts: 280
Joined: Sun Apr 21, 2013 7:14 pm
My Cars: 71 Satellite
70 Challenger
07 300C SRT8
13 Ram C/V (Caravan) work-issued
Location: Vancouver, WA

Re: wont run

Post by 71Satellite98661 » Wed Apr 22, 2015 1:25 am

Sounds like a failed ballast resistor. Verify with a continuity tester across the resistor with at least one of the female spades removed from terminals. If your going to buy one, I'd buy two. Keep a $6 spare in the glove box. :)

moparite
GTX (RS)
Posts: 238
Joined: Tue Apr 21, 2009 8:27 am
My Cars: 1971 Road Runner 4speed FJ6 air grabber car. And yes i have the
build sheet to prove it. NO IT'S NOT FOR SALE!
Location: South Jersey

Re: wont run

Post by moparite » Wed Apr 22, 2015 9:53 am

X2 ! The ballast resistor is used on start and run. Sounds like the run half of it is bad or the terminals have a bad connection. They have been known to heat up and melt.
Image

dangina
GTX (RS)
Posts: 394
Joined: Sat Feb 12, 2011 12:28 am
My Cars: 71 roadrunner
Location: lethbridge, ab

Re: wont run

Post by dangina » Wed Apr 22, 2015 9:44 pm

moparite wrote:X2 ! The ballast resistor is used on start and run. Sounds like the run half of it is bad or the terminals have a bad connection. They have been known to heat up and melt.
Image
according to his pic he has a single ballast resistor, essentially the same diagram:

Image

the only thing the image doesn't show is that the start wire is suppose to be brown
400 stroked to 470ci, 3:55 Eaton true trac, slightly upgraded suspension lol

BUILD THREAD!!!! http://www.protouringmopar.com/showthread.php?796-1971-Speedipus-Rex&highlight=speedipus

kenny
GTX (RS)
Posts: 206
Joined: Tue May 08, 2012 11:15 pm
My Cars: RM23N1G107875

Re: wont run

Post by kenny » Thu Apr 23, 2015 9:48 pm

If you are using a pertronix system you bypass the ballast resistor hook the two wires together and fire it up. I am using that system but kept a stock appearance by replacing the resistor cord with a solid copper wire inside the ballast housing

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