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Date:  10-14-2020
Number of Hours:  1.10
Manual Reference:  n/a
Brief Description:  Wiring mag switch harnesses

Since I'm not using a "traditional" keyed mag/starter switch, things have to be done a bit different. I control the left and right mags with toggle switches, which basically just ground the mag P-lead, preventing spark.

The slightly complicating factor is that the mag P lead also provides the tach signal to the EIS, so some wiring must be piggy-backed on the mag switches.

Adding to that is that the EIS requires either a 27K or 39K resistor in series with the tach sense line This is an experiment. The 27k "should" work just fine, but if not, I'm supposed to swap them out for the 39K resistors that GRT provided in the parts bag.

So, textually working backwards, you have a tach sense wire from the EIS. That goes to a L/R selector toggle since only one mag can feed the tach sense at a time. After the L/R switch , in each of the P leads, is one of the resistor assemblies shown below. Then that feeds into the mag "on-off" switch (in reality a grounded / not grounded switch), then a shielded wire goes to the P-lead on the mag itself.
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