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low volts to coil?

Started by itsbacon, October 27, 2005, 04:46:59 PM

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itsbacon

October 27, 2005, 04:46:59 PM
I'm working on my '71 newport with a 383. the pos side of the coil jumps from o to 6 to 16 volts. when i get the car to run and drive the ignition surges. when its not under load it revs like a banshee. i installed a mopar performance electronic conversion before i discovered the voltage problem, thinking it was the points. my question is whats up with the sporadic voltage? is there a solution other than running a key on hot wire from the fuse box to the coil? thanks in advance, Dave. :punkrocka:

BrianShaughnessy

#1
October 27, 2005, 06:48:51 PM
The ballast resistor knocks down the +12v to the coil + to about +6v or thereabouts.     If the coil gets used at +12v all the time it'll burn up.

Black Betty:  1969 Charger R/T - X9 440 six pack, TKO600 5 speed, 3.73 Dana 60.
Sinnamon:  1969 Charger R/T - T5 440, 727, 3.23 8 3/4 high school sweetheart.

Charger4404spd

#2
October 27, 2005, 06:52:11 PM
Yep, replace the resistor.

Headrope

#3
October 29, 2005, 01:35:29 AM
 :iagree: Experienced a very similar thing. Replaced the ballast resistor and all was better.
Sixty-eights look great and the '69 is fine.
But before the General Lee there was me - Headrope.

Ghoste

#4
October 29, 2005, 06:51:50 AM
Quote from: BrianShaughnessy on October 27, 2005, 06:48:51 PM
The ballast resistor knocks down the +12v to the coil + to about +6v or thereabouts.        If the coil gets used at +12v all the time it'll burn up.



Which is also why the low resistance ballast and the blue regulator from MP are bad ideas for the street.
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