Ignitor grounding

[Skinner]

I currently have my SH775 regulator mounted in the tail piece of my Katana simply because there is no room anywhere else. This requires a long set of wires from the stator and a long set of wires for charging and ground. That said, I may have enough room to mount it on the side of the battery box if I move the ignitor to another location. Does the ignitor unit require grounding? I'm concerned that it may be mounted to the battery box for that reason.

[posplayr]

Stock ignitor? b/w wire is a ground. B/w is harness ground and should go to the SPG.

[Skinner]

Stock ignitor? b/w wire is a ground. B/w is harness ground and should go to the SPG.

Thanks. The b/w is the ground wire to the SPG. So assuming this ground wire is properly connected and grounded then I should be able to move the ignitor to another location away from the battery box.

[posplayr]

Thanks. The b/w is the ground wire to the SPG. So assuming this ground wire is properly connected and grounded then I should be able to move the igniter to another location away from the battery box.

You are correct but also I believe, operating under a false notion. The ignitor is "isolated", and that is why it needs a "ground". What do I mean? Lets compare a stock ignitor to a Dyna-S

The ignitor is electronic and it needs to provide ground paths for the current that it accepts that must get back to the low side of the source. In addition, both the ignitor and Dyna-S both have to sink (accept current) from the low side of the coils in order to ground the coil so current will flow through the coil. So this explains the two wires that go from the ignitors/Dyna-S to the coils. But the Ignitor/Dyna-S also need some power to control the electronic switches that perform this function.

Those circuits also require a ground. So what is the difference between an OEM Ignitor and a Dyna-S. Well if you have looked at a Dyna-S, you will see it only has the three wires mentioned above. That is because the current returns through the engine, to battery strap to the R/R(-). The Dyna-S is NOT ISOLATED, it requires a chassis ground and therefore has NO B/W ground.

On the other hand, the OEM ignitor is electrically isolated from it's mount. That means all the current from the coils plus the internal circuitry must return through a ground and in this case, it is the B/W harness ground which we insure gets back to the SPG.

[Skinner]

You are correct but also I believe, operating under a false notion. The ignitor is "isolated", and that is why it needs a "ground". What do I mean? Lets compare a stock ignitor to a Dyna-S

The ignitor is electronic and it needs to provide ground paths for the current that it accepts that must get back to the low side of the source. In addition, both the ignitor and Dyna-S both have to sink (accept current) from the low side of the coils in order to ground the coil so current will flow through the coil. So this explains the two wires that go from the ignitors/Dyna-S to the coils. But the Ignitor/Dyna-S also need some power to control the electronic switches that perform this function.

Those circuits also require a ground. So what is the difference between an OEM Ignitor and a Dyna-S. Well if you have looked at a Dyna-S, you will see it only has the three wires mentioned above. That is because the current returns through the engine, to battery strap to the R/R(-). The Dyna-S is NOT ISOLATED, it requires a chassis ground and therefore has NO B/W ground.

On the other hand, the OEM ignitor is electrically isolated from it's mount. That means all the current from the coils plus the internal circuitry must return through a ground and in this case, it is the B/W harness ground which we insure gets back to the SPG.

Thanks for the explanation. I almost always learn something new from you!