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Paul Nelson
New User
Username: paulnelson

Post Number: 7
Registered: 03-2018
Posted on Saturday, 23 August, 2025 - 15:54:   Edit PostDelete PostView Post/Check IP

Car is a Spirit Chassis #4629

I have swapped to the Pertronix LU-281 but can't seem to work out how to get power to the coil.

I have attached a photo of the old system

Any help would be greatly appreciated!

Thanks

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Brian Vogel
Grand Master
Username: guyslp

Post Number: 3445
Registered: 06-2009
Posted on Sunday, 24 August, 2025 - 00:29:   Edit PostDelete PostView Post/Check IP

I don't know if either of the following will help, but I hope they might. I replaced the Lucas system in LRK37110 with a Mallory Unilite unit and was faced with figuring out how the wiring should work. There have got to be similarities.

Here's my annotated image of the Lucas 9BR, where the "outgoing side" notes are what will matter:

Lucas 9BR with annotations

Even better, see this post I made on rollsroyceforums.com that includes the above, but larger, and with another diagram that may help you as well.

https://www.rollsroyceforums.com/posts/195476/

Brian
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Brian Vogel
Grand Master
Username: guyslp

Post Number: 3446
Registered: 06-2009
Posted on Sunday, 24 August, 2025 - 04:12:   Edit PostDelete PostView Post/Check IP

Credit @Wraithman for this diagram, which may be all you need, particularly if you're looking to eliminate the use of the 9BR entirely.

Wraithman's diagram for Pertronix LU-281

Full sized version: https://1drv.ms/i/c/2eb6bcfca483d174/ER9-CvBACOVBq46maVVRAhcBGdXVgObQjfMyqynDMEulDQ?e=4Kv59q

Brian
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Paul Nelson
New User
Username: paulnelson

Post Number: 8
Registered: 03-2018
Posted on Sunday, 24 August, 2025 - 07:53:   Edit PostDelete PostView Post/Check IP

Thank you - this will help!

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