Ignition issues

Tiny
FURY-GUY
  • MEMBER
  • 1965 PLYMOUTH FURY
  • V8
  • 2WD
  • MANUAL
  • 168,000 MILES
I have a 65 Fury II, I changed the plugs and wires, coil, rebuilt the carborater and changed the ignition switch but it still won't stay idling. It turns over and starts but as soon as I let go of the key in the ignition it stalls again. Any other ideas on what might be my issue?
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Wednesday, August 10th, 2016 AT 7:30 PM

6 Replies

Tiny
CARADIODOC
  • EXPERT
That's the classic symptom of an open ballast resistor. It gets bypassed by the ignition switch when it's in the "crank" position. That's why the engine runs as long as you hold the key there. If you hold it with one hand and shift to "drive" with the other hand, the neutral safety switch will cut out the starter and the engine will stay running.

You can verify this by turning the ignition switch to the "run" position, then measuring the voltage on the positive terminal of the ignition coil. The voltage will vary depending on whether the breaker points are open or closed. With them closed, you'll find close to 0 volts. With them open, you should find 12 volts. This should be tested with a test light. If you use a digital voltmeter, carbon tracking through the break in the resistor can allow enough current through for the voltmeter to pick that up and falsely show 12 volts.

You can rotate the engine by hand to make the points switch between open and closed.
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Wednesday, August 10th, 2016 AT 11:15 PM
Tiny
FURY-GUY
  • MEMBER
We bypassed the resistor and it still does the same thing it just bogs and shuts off it never really engages. Any other ideas?
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Thursday, August 11th, 2016 AT 12:09 PM
Tiny
FURY-GUY
  • MEMBER
Figured it out, broken wire. Thanks for the tip about the resistor, it was a wire on that.
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Thursday, August 11th, 2016 AT 5:27 PM
Tiny
CJ MEDEVAC
  • EXPERT
'Nuther guy

Should you ever have the ballast resistor fry/ go out. Just to get you back in, you can jump across it's terminals with a wire/ paper clip/ piece of barbed wire/ etc. Replace it soon as you can!

The Medic
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Thursday, August 11th, 2016 AT 6:56 PM
Tiny
FURY-GUY
  • MEMBER
Thanks for the tip CJ, that's how we figured out that it was a broken wire from the resistor to the ignition. We jumped across terminals and it still didn't work so we traced wires and what do you know. Broken. Thanks to everyone offering solutions they were very helpful.
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Friday, August 12th, 2016 AT 6:56 AM
Tiny
KEN
  • ADMIN
Thanks for using 2Carpros, we are here to help.

Best, Ken
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Friday, August 12th, 2016 AT 12:25 PM

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