Lucas Ignition Amplifier Delete

[Origin7]

I've upgraded my Xflow to a 123 Ignition system. I still have the Lucas ignition amplifier connected and would like to delete it. However, when I unplug it from the loom, things get weird. Everything works fine until I turn on the lighting system. When I do, some of the gauges peg at 100%. It seems like a grounding issue.

 

My plan is to disconnect the amplifier and test for continuity to see which wires are connected internally. Then I will make a "jumper" plug to insert into the loom and bridge those wires.

 

I don't have a schematic, so I am a little concerned about what else may be tied into this amp. I'm hoping someone has already been through this and can tell me if I'm missing anything.

 

Thanks in advance! 

[Origin7]

I dug into this a little further today. For some reason, the gauge and lighting circuit seems to be grounded through the Lucas ignition amplifier. I am scratching my head as to why they did this. Anyway, the two black wires in the harness going to the amplifier are ground wires. If you want to bypass/delete the original Lucas amplifier, all you need to do is tie these to ground, and you're good to go. 

[7Westfield]

Glad you found it, sounds like the KISS principle never made it to England