Re: Sure ccould use some expert help on this ignition issue

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frankr

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#81106
quote FrankR:

Your understanding is basically correct. A magnet passes the charge coil, generating a voltage that is stored in a capacitor in the power pack. The magnet then passes the sensor, which sends a small voltage to the power pack that signals a SCR (electronic switch) to send the voltage from the capacitor to a coil.

The second magnet with North and South poles reversed repeats the process, except the polarity of the voltages is reversed. The reversed polarity signals another SCR to send the voltage from the capacitor to the other coil.

So, common sense says that the difference between #1 and #2 is the two SCRs responding to different polarities. Since there is only one charge coil providing both polarities and one sensor doing likewise, the only thing that makes sense is you have bad SCR in the power pack.

I think I said that right

EDIT: To clarify, there are two SCRs in the power pack. First one responds to a negative voltage from the sensor and the second responds to a positive voltage from the sensor. One of yours is shot.

EDIT EDIT: Of course the problem could also be a bad coil, except you said you eliminated that by swapping coils. So it isn’t the coil.