7MGFORCE Posted July 10, 2009 Share Posted July 10, 2009 hi so i decided to follow this site for my ignition system. http://www.carbdford.com/tech/HEI/hei.htm i basically used the stock wires that went to the stock coil. so i used the possitive output and the negative/tach output. when i crank the car i didnt get any spark what so ever. im curious why it does not work. i have tripple check everything and all connections are good but again no spark. any sugestions? side questions the dizzy has a vacuum nipple where do i connect it? FYI: this is on an early 74 260z. with a 1990 mustang 5.0 that is carb. Quote Link to comment Share on other sites More sharing options...
Mike kZ Posted July 10, 2009 Share Posted July 10, 2009 Did you by-pass the ballast resistor? You need 12 volts at the + side of the coil, with key on, and when cranking. Quote Link to comment Share on other sites More sharing options...
7MGFORCE Posted July 10, 2009 Author Share Posted July 10, 2009 Did you by-pass the ballast resistor? You need 12 volts at the + side of the coil, with key on, and when cranking. Which one is the ballast resistor? And how do I by pass it? Quote Link to comment Share on other sites More sharing options...
7MGFORCE Posted July 12, 2009 Author Share Posted July 12, 2009 The ballast resistor is the white looking rectangle next to the coil with 3 wires right? Well I connected the 3 wires and tried again. The possitive on coil drops to 8.x during crank prolly bc of starter drain. Still no spark though. Btw is the negative/tach on coil suppose to have 12v ? Mine has a possitive output. Edit after regrounding everything I was able to get spark. But it's very very weak spark. I could barely see it. I used the main spark plug that connects to the coil as my tester using ascrew driver. Btw how many spark per second am I suppose to see? Bc when it was being crank I could only see 1 every few second I would thing it would be more per second when cranking bc it's a v8 Quote Link to comment Share on other sites More sharing options...
Mike kZ Posted July 13, 2009 Share Posted July 13, 2009 Do you have a Duraspark distributor? That article says you need one. The voltage dropping while cranking is normal. Does the engine block have a good ground to the frame or battery? Quote Link to comment Share on other sites More sharing options...
7MGFORCE Posted July 13, 2009 Author Share Posted July 13, 2009 Do you have a Duraspark distributor? That article says you need one.The voltage dropping while cranking is normal. Does the engine block have a good ground to the frame or battery? Yes I do have duraspark dizzy. The car now have spark and I made sure The grounds are solid and I ground the engine and chassis. My question is, is it normal to have a weak spark when the engine is just cranking? I have to sort out my pump wiring before she start unfortunately so I can't see how the spark is when running Quote Link to comment Share on other sites More sharing options...
Mike kZ Posted July 14, 2009 Share Posted July 14, 2009 I have seen sparks that look weak, but the engine runs fine. Give it try and see what happens. Quote Link to comment Share on other sites More sharing options...
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