Help with CNW e-starter install - kill switch/Trispark conn

My CNW electric start kit is installed, and I have a Trispark & CNW coils on a Mk IIa. I'm a bit - ok, completely - confused over the kill-switch wiring, and I'm hoping somebody who's already done this can help out.

Matt has always been exceptionally helpful and hugely generous with his time on the phone and meticulous with his instructions, and if this was Tuesday I'd call him, but it's Sunday and Monday is a day off for him and a workshop opportunity for me to finish what any normal human would've finished ages ago.

Moving along...

From the kill switch, I have three wires.

• Yellow/green which goes to yellow/green from the starter relay - obvious enough that even I can get it right.

• The destructions say that the red from the CNW switch goes to (any) switched hot to energize the relay. I have done that, and the electric start happily turns the motor over when I push the start button's.

• My question concerns the remaining red/white wire. The instructions say "Red/white from CNW switch to electronic ignition power. This should be the only lead going to the coil/ignition. This will allow you to turn the bike off with the toggle on top of the handlebar switch". My interpretation is that I disconnect the black/white that runs from the Trispark to the (CNW) coil, and connect the red/white from the CNW switch to the black/white from the Trispark. If I do that, there is therefore only one lead going to the coil, which is obviously wrong.

Does anyone know the correct solution please?

By the way, for anybody on the fence about an electric thumb, the starter kit is, as always from CNW, a thing of great beauty, complete with every minor part you could possibly think of. I was very nervous about spending that much money on such an option, having bought many "kits" from various vendors which turned out to be laughably incomplete. Not this one. EVERYTHING is included down to the very last detail, and perfectly packaged which always helps. For sheer completeness, I couldn't recommend it highly enough. Whether it's worth it to you financially or not depends on how bad your knee is...

Alex

Re: Help with CNW e-starter install - kill switch/Trispark c

I agree with all of your assessments regarding the CNW electric start kit. I have the exact same configuration on my '74 Roadster. I too was totally befuddled
By the instructions that came with it in regards to the starter/kill switch supplied. Yes, I could figure out how the starter switch worked, but couldn't understand the instructions about wiring in the kill switch. So, here's what I did: I gave up on the supplied starter/kill switch (which I thought was kind of clumsy looking) and traced the leads from the unused button on the OEM right switch cluster to their terminus under the tank and completed the power connection there instead of in the headlight shell with the supplied apparatus. This left the original red OEM kill button still operational and, in my estimation, a much nicer looking assembly. I understand that Matt would not want his kit to be contingent on the iffy electrical switches of a 40 something year old Lucas assembly and the legal liability of an old kill switch which might not work. Mine works perfectly. Of course I have disassembled and cleaned up this switch assembly so that I know it makes good contacts.
In other words, you don't have to wire in the kill function of the CNW switch. The stock kill switch still works.

I love my cNw electric starter!!!!!!!!!!!!!!!!!!!! It is Awesome!

Re: Help with CNW e-starter install - kill switch/Trispark c

Thanks, much appreciate your comments.

Unfortunately that won't work for me as I no longer have the stock switches.

Hopefully someone else can shed some light, if they used the CNW switch?

Alex

Re: Help with CNW e-starter install - kill switch/Trispark c

Alexol said:

• My question concerns the remaining red/white wire. The instructions say "Red/white from CNW switch to electronic ignition power. This should be the only lead going to the coil/ignition. This will allow you to turn the bike off with the toggle on top of the handlebar switch". My interpretation is that I disconnect the black/white that runs from the Trispark to the (CNW) coil, and connect the red/white from the CNW switch to the black/white from the Trispark. If I do that, there is therefore only one lead going to the coil, which is obviously wrong.

Click to expand...

Look at the schematic, the kill switch is wired in between the master switch (White) and the coil (White Yellow to White Blue), before it goes to the ignition.

http://rocbo.net/technique/norton_works ... /j/j10.gif

Re: Help with CNW e-starter install - kill switch/Trispark c

I know what you're talking about, I just installed Mat's kit last week. Viewing the coil from the rear, you should have the black/white terminated on the right terminal and two red/white wires terminated on the right terminal. One of the two goes to the tri spark, the other is the one coming from the switch

Re: Help with CNW e-starter install - kill switch/Trispark c

I just read my reply and I need to correct myself. That should be the black/white wire on the LEFT terminal and the red/white wires on the right.

Re: Help with CNW e-starter install - kill switch/Trispark c

Alexol said:

• My question concerns the remaining red/white wire. The instructions say "Red/white from CNW switch to electronic ignition power.

Click to expand...

The Tri-Spark ignition power wire (positive earth/ground) is black/yellow, therefore the ignition power feed from the kill switch should connect to Tri-Spark black/yellow. However, for negative earth/ground it would be the red.

http://www.trispark.com.au/images/Class ... 5%20V6.pdf

Alexol said:

This should be the only lead going to the coil/ignition. This will allow you to turn the bike off with the toggle on top of the handlebar switch

Click to expand...

Alexol said:

". My interpretation is that I disconnect the black/white that runs from the Trispark to the (CNW) coil, and connect the red/white from the CNW switch to the black/white from the Trispark. If I do that, there is therefore only one lead going to the coil, which is obviously wrong.

Click to expand...

I believe this is because you are interpreting "coil/ignition" as ignition coil(s) and not coil(s) and/or ignition.

Re: Help with CNW e-starter install - kill switch/Trispark c

lab is right regarding interpretation. The key words are "and/or". In my case it's "and". I have a CNW wiring harness in which red/white wires are switched power. The harness has a red/white wire run from the coil to the tri spark red wire, hence the second red/white wire at the coil I referred to. My bikes are wired negative ground. On a side note, Matt told me he had some bad news. The bad news being that I would be installing a starter on my other 750. He was right, this thing is killer! Push the button, go riding. The workmanship on this product can't be beat, seems a shame to bury it away under a primary cover

Re: Help with CNW e-starter install - kill switch/Trispark c

Thanks to everyone for the help.

It's not easy being electrically incompetent! Still haven't fully wrapped my head around the positive earth thing...

Light finally dawned when a friend pointed out that I was assuming a degree of modernity, i.e. the kill switch also prevented the starter from turning.

Finally, it was very easy:

• • Black/yellow from Tri-spark was originally going to a switched hot.
  
  • I disconnected it from the switched hot and connected it (black/yellow from Tri-spark) to the red lead from the CNW switch.
  
  • Then connected the red/white from CNW switch to switched hot, where the black/yellow from Tri-spark had originally been connected.

I have other things to do on the bike so didn't button it all back together, but using an auxiliary external tank the bike started second push of the button, and the kill switch stopped it appropriately. No direct connections were made to the coils. Don't know if that's technically correct or not, but it works.No explosion, no smoke escaping from wires etc., so presumably it isn't too far wrong!

For peace of mind,, I will check with Matt tomorrow and if I have to make changes I'll note them here.

Once again thanks for the help!

The hard-core purists may not be impressed with an electric foot on a pre-Mk III, but I am totally, absolutely delighted!

Alex