Milwaukee 8 Coil Differences
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6th Gear
Joined: Jul 2019
Posts: 10
Likes: 1
From: Atlanta
Single counter balance shaft on the touring and dual counter balance shaft on the Softails is the main difference unless you are comparing to a dual cooled touring model of which there are arent many.
I suppose it is possible to not have the plug wires seated fully and thus the problem not being the coil but the installation.
Maybe the spark plug wires are different since most of the touring models have some kind of radio or infotainment system. An increased resistance of spark plug wires required for touring may require a coil with a higher output? Pure speculation with no factual basis though.
I wonder if I has something to do with center spark plug vs outboard spark plug and where they are connected to the coil?
Set the Softail coil and the touring coil side by side then use an ohm meter to compare readings between the two. That might tell you something.
All that being said, I am shaking my head at this conversation and why anyone would do this. Lets go ahead and fix a perfectly running motorcycle until it doesnt run and then try to figure out why it no longer runs.
FWIW, on older carbureted bikes, It didnt much care, as long as there was a spark. Dual fire meant it didnt matter how the front and rear spark plug wires were plugged in and was actually a troubleshooting tool.
I suppose it is possible to not have the plug wires seated fully and thus the problem not being the coil but the installation.
Maybe the spark plug wires are different since most of the touring models have some kind of radio or infotainment system. An increased resistance of spark plug wires required for touring may require a coil with a higher output? Pure speculation with no factual basis though.
I wonder if I has something to do with center spark plug vs outboard spark plug and where they are connected to the coil?
Set the Softail coil and the touring coil side by side then use an ohm meter to compare readings between the two. That might tell you something.
All that being said, I am shaking my head at this conversation and why anyone would do this. Lets go ahead and fix a perfectly running motorcycle until it doesnt run and then try to figure out why it no longer runs.
FWIW, on older carbureted bikes, It didnt much care, as long as there was a spark. Dual fire meant it didnt matter how the front and rear spark plug wires were plugged in and was actually a troubleshooting tool.
Hahaha maybe you guys missed it but bike is back on the stock setup on I was simply testing out the new style coil and was curious on why that didnt work, bike runs and operates normally now no codes. Trust me Id rather have a running bike than looking at plug wires.
and I thought the same I really didnt think it mattered all that much, Ive swapped coils out of different cars/trucks with LS motors and never had an issue and just assumed itd be the same situation since the wiring was similar
Seasoned HDF Member
Joined: Dec 2005
Posts: 19,923
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From: poway
Single counter balance shaft on the touring and dual counter balance shaft on the Softails is the main difference unless you are comparing to a dual cooled touring model of which there are arent many.
I suppose it is possible to not have the plug wires seated fully and thus the problem not being the coil but the installation.
Maybe the spark plug wires are different since most of the touring models have some kind of radio or infotainment system. An increased resistance of spark plug wires required for touring may require a coil with a higher output? Pure speculation with no factual basis though.
I wonder if I has something to do with center spark plug vs outboard spark plug and where they are connected to the coil?
Set the Softail coil and the touring coil side by side then use an ohm meter to compare readings between the two. That might tell you something.
All that being said, I am shaking my head at this conversation and why anyone would do this. Lets go ahead and fix a perfectly running motorcycle until it doesnt run and then try to figure out why it no longer runs.
FWIW, on older carbureted bikes, It didnt much care, as long as there was a spark. Dual fire meant it didnt matter how the front and rear spark plug wires were plugged in and was actually a troubleshooting tool.
I suppose it is possible to not have the plug wires seated fully and thus the problem not being the coil but the installation.
Maybe the spark plug wires are different since most of the touring models have some kind of radio or infotainment system. An increased resistance of spark plug wires required for touring may require a coil with a higher output? Pure speculation with no factual basis though.
I wonder if I has something to do with center spark plug vs outboard spark plug and where they are connected to the coil?
Set the Softail coil and the touring coil side by side then use an ohm meter to compare readings between the two. That might tell you something.
All that being said, I am shaking my head at this conversation and why anyone would do this. Lets go ahead and fix a perfectly running motorcycle until it doesnt run and then try to figure out why it no longer runs.
FWIW, on older carbureted bikes, It didnt much care, as long as there was a spark. Dual fire meant it didnt matter how the front and rear spark plug wires were plugged in and was actually a troubleshooting tool.
You idea of measuring the coil windings might show some difference. I would expect that the primary resistance would be the factor. Maybe the polarity of the coils. Not sure how they are wound.
As far as screwing things up, how you gonna learn how it works if you don't mess something up?
Seasoned HDF Member
Joined: Dec 2005
Posts: 19,923
Likes: 8,027
From: poway
Should have read LPs response..
DTC P2301 - Ignition Coil Driver Shorted High (Front)
I guess the coil primary resistances are different. The softails run a lower primary resistance coil. Coil needs less dwell.
DTC P2301 - Ignition Coil Driver Shorted High (Front)
I guess the coil primary resistances are different. The softails run a lower primary resistance coil. Coil needs less dwell.
Stellar HDF Member
Joined: Sep 2009
Posts: 2,114
Likes: 666
Theres more to this than we know yet.
A shorted code means the observed voltage/resistance is not what the ECM expects... so it shuts down the engine?
I have to assume theres still more to this story than we know...like Steve said.
Seasoned HDF Member
Joined: Dec 2005
Posts: 19,923
Likes: 8,027
From: poway
Ya gotta wonder how the engine knows which coil its running with?
Theres more to this than we know yet.
A shorted code means the observed voltage/resistance is not what the ECM expects... so it shuts down the engine?
I have to assume theres still more to this story than we know...like Steve said.
Theres more to this than we know yet.
A shorted code means the observed voltage/resistance is not what the ECM expects... so it shuts down the engine?
I have to assume theres still more to this story than we know...like Steve said.
I'd put my money on the smart coil driver. That way of the processor in the ECU should fail to turn off the drive, the driver would shut itself off. This is a safer option as it would keep the wiring and coil from possible overcurrent should the ECM processor lock up.
HD EFI Guru
Joined: Jan 2008
Posts: 4,488
Likes: 4,776
See post 13. My only guess is due to coil temperatures. The Touring coil is buried under the battery and behind the rear cylinder with very little airflow to/around it and most of what it gets is hot air. The Softail is out in the breeze away from most of the heat with plenty of airflow to it. The engine requirements are no different between them.
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