82 xj650rj igniter unit re-wire question

I am doing an entire harness re-wire on an 82 xj650rj using an m-unit. I am having a little trouble understanding how to re-wire the igniter unit if I am bypassing the starter circuit cut-off relay that the R/W wire goes to on the oem diagram. From what I can tell from the diagram:

• The big connector (G/Y, O, B wires) connects to the pick up coil and B/W wire from the same connector goes to side stand relay
• Smaller connector (G/Y, O, R/W wires) connects to coils and R/W goes to coil and branches off to starter circuit cut-off relay.

My question is: what if I am bypassing the starter circuit cut-off relay due to having an m-unit? How does the igniter unit receive power? I believe it is from the R/W wire, but it needs to be switched power, correct? How should this be connected in an m-unit system? I attached the oem diagram with boxes around the wires I am having trouble with. Little confused on this one. Thanks for your help in advance!

 

Per the literature for the M-unit, the Auxiliary output is supposed to be dedicated to the ignition circuit.

The starter cutoff relay is part of the safety feature and you will have to decide how much of that you want to incorporate into the M-Unit wiring.

As for the R/W wire going to the starter cutoff relay that is just a parallel path utilizing the 12V ignition circuit and it is irrelevant to how the TCI receives power

Here is a good thread where @jayrodoh provided a nice diagram for incorporating safety features

https://www.xjbikes.com/forums/threads/relays-or-not-to-relay.72383/page-2#post-479879

and another

https://www.xjbikes.com/forums/threads/xj650rj-seca-build.111444/page-4#post-574112

 

Thank you for the reply! I should mention that I have an m-unit blue. The manual shows that the igniter unit is on the ignition output rather than the aux output. I read the thread you mentioned on safety switches and will refer back to it while wiring the neutral switch, but I am still confused on how to wire the igniter unit if I am bypassing the starter cutoff relay and how it receives power/how to make sure it works in an m-unit system.

How does the igniter unit receive battery power? What wire on the igniter should be connected to the m-unit. I apologize for my confusion or if I am missing something in your answer and in the threads you mentioned!

 

The igniter (TCI) is powered by the R/W wire, which goes directly to the ignition fuse in the stock harness. When using the M-Unit the R/W wire on the TCI would connect to the Aux or Ignition output in your case with the basic diagram that they suggest.

The starter cutoff relay will just go away, as that function is incorporated into the M-unit, although not as robust as the original version. That's why you need to look at what Jayrodoh suggested if you want to have all the safety features maintained.

 

I understand now, thank you! I will definitely re-read jayrodoh's thread then!

 

I'm glad I came across this, as I am also doing a complete re-wire of my 80 XJ650 Maxim using the M.unit Blue. If I'm understanding correctly, the bike has a TCI and not a CDI? Therefore I do not need to incorporate the relay that they say to use if a CDI is involved?

 

I am not sure on this, but the threads that rooster53 attached to his post could help you with your questions.

 

Before I posted a comment, I did follow the Revival Cycles wiring to T for the most part, and assuming I have a CDI I did implement the relay. But, without the other end plugged into the ignition port, I get the engine to crank but obviously no spark on the plugs. But with it plugged into the ignition port, the solenoid clicks and I get maybe an inch of rotation on the pickup coil. So I'm not entirely sure what I've done wrong and am still trying to figure it out. Extremely novice with electrical work but understand it somewhat.