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Techical Discussions => Tech- - ELECTRICAL => Topic started by: firedome on December 05, 2008, 04:21:44 AM

Title: Electronic Ignition Ballast Resistor
Post by: firedome on December 05, 2008, 04:21:44 AM
Anyone know when the Ballast Resisitor went from 2 wire to a 4 wire
with the built-in auxiliary .5v ballast resistor,  and why? 
Always carry a spare in the glove box!

Title: Electronic Ignition Ballast Resistor
Post by: Leaburn Patey on December 05, 2008, 04:52:16 AM
IIRC,the dual ballast began at about
73-74.
On models equipped with dual ballast,voltage is limited by a pair of resistors.
Primary  for the coil,of course, and the auxilary side limits the voltage to the ECU.This is usually the "5 pin" type ECU set-up.
Some models were equipped with a speed limiter curcuitry to prevent engine damage from excessive RPM's
When doing an electronic ignition conversion on a  car use a single ballast and 4 pin ECU.
 
Title: Electronic Ignition Ballast Resistor
Post by: firedome on December 05, 2008, 12:27:44 PM
I presume you refer to conversion ie: eliminating the Lean Burn , Lea Burn? - hee hee.   
Title: Electronic Ignition Ballast Resistor
Post by: Leaburn Patey on December 05, 2008, 02:22:10 PM
Yeah,Yeah.I get that all the time,bleh,LOL
Electronic Ignotion did use the dual ballast for a short (hic) time right before the Lean Burn system appeared.IIRC,all Lean Burn cars had dual ballasts.
 
Title: Electronic Ignition Ballast Resistor
Post by: Dan Cluley on December 05, 2008, 08:56:32 PM
My 1974 Dart with 318 has a factory electronic ignition with the 4 wire resistor and the 5 pin box.
 
According to the FSM that should be the case for all '74 models.