K75 wiring puzzle - K-Bikes.com - Excellence in Motion
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post #1 of 4 (permalink) Old Mar 24th, 2011, 6:02 pm Thread Starter
Join Date: Feb 2011
Location: notts, , uk
Posts: 15
K75 wiring puzzle

I have dropped a k75 engine into a small car.

I have done the engine wiring as much as possible using the fuel injection control box, ignition control box, the fuel injection relay, separate fuel pump relay. I have used a standard blade fusebox and also an inertia switch in case of an accident to shut the engine and fuel pump down.

I have just spun the engine over and it's not trying to fire. I disconnected the fuel pump supply (as it was wurring and drowning everything else out) turned the ignition switch on and heard the fuel pump relay click in, but not the injection relay. I removed the relay and tested with my test probe and it clicked. So i checked all wiring to the relay and everything checks out apart from the Yellow/brown wire (which I assume is earth to the ignition unit)

This wire tests ok to the ignition unit. I decided to test all the brown cables coming out the ignition box and found one with no continuity. This brown is next to a blue/black cable in the multi-plug.

Would this loss of continuity on this brown wire explain the lack of the relay clicking in?

let me know what you think.
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post #2 of 4 (permalink) Old Mar 24th, 2011, 11:21 pm
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Location: Los Angeles, CA, USA
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I think I read that the brown wires are ground, so yes, it could be the problem. But there are many more members here who know much more than I do...
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post #3 of 4 (permalink) Old Mar 25th, 2011, 4:21 am Thread Starter
Join Date: Feb 2011
Location: notts, , uk
Posts: 15
my plan is to couple the earth part of my test probe to the brown that has no continuity and then trigger the relay and see if i clicks.

Does anyone have a pin layout for the k75 ignition unit as I can find them for the k100 but not the 75

I thought it would be a good time to post a pic of my car. I have since got all the water pipes installed but not took fresh pics yet


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post #4 of 4 (permalink) Old Mar 26th, 2011, 4:11 pm Thread Starter
Join Date: Feb 2011
Location: notts, , uk
Posts: 15
I found the problem, there was a fractured wire in the Ignition control unit harness.

Cost me a new snap-on harness testing unit, but it found the fault straight away. Tested the system thru and everything is working as supposed to
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