Posted June 6, 20213 yr comment_622859 Lets try this again. I have now wired up the ballast and coil as per manual. i get power only to the black/white at the resistor and when all wired and key on no power to the coil. is this an ignition control unit issue? what should happen when i try to start the car? should power then go from the resistor to the coil?? why would it not? bad ICU? need some help here!! looks to be wired correct??? blue to neg blackwhite pos.. Link to comment https://www.classiczcars.com/forums/topic/65478-1974-260z-no-spark-from-coil/ Share on other sites More sharing options...
June 6, 20213 yr comment_622860 That sounds like a ballast resistor issue. Power passes through the ballast resistor to the coil. Measure resistance from the point that the W/B (white with black stripe) wire connects to the other two terminals. When the key is on (IG) the longer path is used, during Start the shorter path is used. But both paths should pass current. The ballast resistors do fail. Link to comment https://www.classiczcars.com/forums/topic/65478-1974-260z-no-spark-from-coil/#findComment-622860 Share on other sites More sharing options...
June 6, 20213 yr comment_622872 Try to not start a new thread if you already have one going on a similar or relevant topic. It junks the forum up and keeps all the information for solving the problem in one thread Link to comment https://www.classiczcars.com/forums/topic/65478-1974-260z-no-spark-from-coil/#findComment-622872 Share on other sites More sharing options...
June 6, 20213 yr Author comment_622873 Ok. How exactly does the electronic ignition unit fit into this? Most people say if you have a good coil ( brand new) and hook it up properly as per manual and no spark - it’s most likely the electronic ignition unit. If when the key is turned to power position the black white wire by the coil gets power , can it still be the electronic ignition unit?? Link to comment https://www.classiczcars.com/forums/topic/65478-1974-260z-no-spark-from-coil/#findComment-622873 Share on other sites More sharing options...
June 6, 20213 yr Author comment_622874 What I’m getting at here is there a way I can eliminate the electronic ignition unit? Is there a way to determine that it is actually working? Thanks Link to comment https://www.classiczcars.com/forums/topic/65478-1974-260z-no-spark-from-coil/#findComment-622874 Share on other sites More sharing options...
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