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Switched Live - Electronic Ignition Issues


Guest 2Bbuilt

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Guest 2Bbuilt

I am having issues with my simonbbc electronic ignition, car has blown 2 modules so far. (2.0 litre pinto)

 

Fitted new electronic dizzy, ran for 2 weeks then stopped, no spark. Change electronic module, ran for a few weeks then stopped again, no spark.

 

trying to track down the problem.

 

investigation reveals

 

Issue 1 - live to positive on coil, live from positive to dizzy. earth from dizzy to coil, no other wires attached

 

i have 12v on the NEGATIVE side of coil????? don't know if it was like this before it stopped working.

 

Issue 2 - When ignition switch is off, i have earth continuity on the live wire (to coil), is this what a switched live does???

Edited by 2Bbuilt
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12v normally on negative side of coil: 12v supplied to positive side, then the wire back from the coil is momentarily earthed to create the spark. You would read 0v with an oscilloscope with engine running, but not with a multimeter.

 

Switched live will have some continuity to earth through various components to earth.

 

I did have an issue once with a loose HT lead, which caused the to spark to earth through the hall sensor in my dizzy, frying it. Might not be your issue but worth a check! hopefully someone with some experience of your setup will post. What system are you running?

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It works, for a while at least so there can't be to much wrong with the basic circuit, so the problem must lie with the bits not changed.

 

The modual that is failing is just a switch, that is turned on and off when it sees a signal from a trigger switch linked to the mechanical operation of the engine, such as a hall effect, or optical sensor.

 

It's failure can be caused by rouge HT, but also by a to higher current through the modual.

 

Check the modual manufacturers spec, it will be designed to switch 12volt, have you a 9volt ballast resistor coil, or the ballast resistor still in circuit that will cause a higher current (amps) that may burn out the module, also make sure the connections are good which can give the same problem

Edited by knights_templar
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Guest 2Bbuilt

its not charging at all.

 

possibly unrelated to issues but not helping if i need to keep charging battery

Edited by 2Bbuilt
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