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View Full Version : No spark at coil...until I turn the ignition off?


scott88prostar
06-26-2007, 08:29 PM
So out on the boat with 6 kids tubing....the voltage meter was spiking a bit....then it dies. ...Boat cranks...I put the timming light on the coil wire and the light only flashes when I turn the ignition off. Checked the ohms of the coil and it seemed ok.....I looked behind the dash because many years ago I wired the kill switch together....Is that the purple wire?....If the saftey switch is not making a connection the gauges will work right? ...and it will crank....I have electronic ignition....could this have failed?....Im stumped!

WilliM1940
06-26-2007, 09:48 PM
Right, this happened earlier in the year to someone, do a search. Your primary field does not collapse until the switch is turned off, which induces voltage in the secondary field. Old style, your points are not opening and closing, you are not switching the power on and off to the primary.

scott88prostar
06-26-2007, 10:00 PM
Willi.............huh?...I dont have points.....so could it be the electronic ignition?

WilliM1940
06-27-2007, 08:34 AM
Yes, I was just using the points opening and closing as a direct example of powering and unpowering the primary winding, like you are doing now with your key. Yes it sounds like your electronic ignition module, your pickup sounds as if it has failed. You are not powering and collapsing the primary winding.

scott88prostar
06-27-2007, 08:48 AM
Thanks Willi!

scott88prostar
06-28-2007, 06:49 PM
Who da man!...........Willi da man!....thanks 37.00 dollars for a new module( plus $20 to overnight ship) to Summit Racing.....6 hours of looking like a little Nancy cause my boat doesnt work....and the 454 sound of thunder is back!...Priceless..........any time your in Northern ILL and want a pull come on down!:banana: :banana: :worthy:

scott88prostar
06-29-2007, 07:57 PM
the voltage is still spiking and the tach jumps up...is it my alternator?.( i spoke too soon?)

scott88prostar
06-29-2007, 07:58 PM
the voltage is still spiking and the tach jumps up...is it my alternator?.( i spoke too soon?)...but it does start.

WilliM1940
06-29-2007, 08:43 PM
I am wondering if your voltage regulator is done. Maybe that is what fried your electronic ignition. If it were me, I would look up a test procedure for the regulator, or just buy a new one. Older Chevies had the replaceable voltage regulator in the alternator, pretty cheap, but I don't know what you have being it is marine. Any EE's here?

WilliM1940
06-29-2007, 08:52 PM
Time for you to head over to CCfan and read your engine manual. Link:
http://www.correctcraftfan.com/Downloads/PCM%20Owners%20Manual_New.pdf

WilliM1940
06-29-2007, 09:00 PM
And it appears your voltage regulator is solid state external on the back electrical brick of the engine.

scott88prostar
06-29-2007, 09:45 PM
Thanks again Willi...I'll try in the morning....CC proceedure manual is interesting.

scott88prostar
06-30-2007, 03:42 PM
I took the alternator in and it checked out....clean and tightend connections to the alternator and grounds..seems to have fixed the problem....after reading some posts Im curoius as to how hot a coil should get...after running it in the driveway for 20 minutes I can hold my fingers on it for about 10 seconds before it becomes uncomfortable.....I didnt even know they got hot...how hot should they get?......I did check the ohms against a new coil.