Scimba - Back in the game

If you have a long-term project and would like to share/document progress, this is for you.

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philhoward
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Scimba - Coming back

Post by philhoward » Sun Aug 06, 2017 8:25 am

As it's a 5a, why not run a new feed straight from the tachometer, hence bypassing the Eureka wire and getting your 12v that way? I think you need a male bullet connector for the tacho end, then that should give you the full 12V and hopefully still a working tacho.


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Post by Crowther » Sun Aug 06, 2017 1:47 pm

I wouldn't mind bypassing the ballast altogether. Would the dash need to come off though?


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Learning slowly and driving quickly...

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Scimba - Coming back

Post by philhoward » Sun Aug 06, 2017 2:09 pm

It's doable but fiddly. If you can see the back of the tacho, you stand a chance - there are two bullet connectors. Ignition live in, and out to the Eureka wire, both grey moulded (one male which I think is to the Eureka wire and a female which is the ignition feed in straight from the ignition switch). A meter or test lamp will confirm.


Phil Howard
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SS1's - 1600 Rooster Turbo; Sabre Mk1.5
SE5a Barn Find Project 24 Valve conversion
Previous: SE5/5a/SS1 No.1/SS1 Rooster/SS1 1800Ti
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Never try and argue with an idiot. They drag you down to their level, then beat you based on experience.

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Scimba - Coming back

Post by Crowther » Sun Aug 06, 2017 9:08 pm

Thanks Phil. I'll give it a try.


New and proud owner of "Scimba" ('72 SE5a).
Learning slowly and driving quickly...

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Scimba - Coming back

Post by Crowther » Wed Aug 09, 2017 9:37 pm

Well, I got the tacho out and labelled all the wiring after confirming that the male bullet (white) was feeding coil +ve. First I double-checked the voltage at the coil with the coil -ve earthed and the ignition on. 5V. Low but clearly ballasted.

Now I just need to work out how to get the new wire from the back of the tacho to halfway up the wing on the opposite side of the car!!

I'm assuming it pops out here?

I peeled off some of the tape but I can't see it. That braided wire terminates in a BOLTED CONNECTION with three ring terminals that seem to go to the ignition control fuse. That can't be standard, surely???

(I also discovered a lot of water in the passenger footwell when I was crawling around wire-hunting)
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New and proud owner of "Scimba" ('72 SE5a).
Learning slowly and driving quickly...

Crowther
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Scimba - Coming back

Post by Crowther » Tue Aug 15, 2017 10:05 pm

Well the new eureka bypass wire is hooked up! I think "fiddly but doable" was a perfect summary Phil. The electronic ignition is getting a clean 12V and the coil has been replaced with a 12V Lucas jobby. The engine starts and runs well and tomorrow I will take it out on the road to see I the hot misfire is still there...


New and proud owner of "Scimba" ('72 SE5a).
Learning slowly and driving quickly...

Crowther
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Scimba - Back in the game

Post by Crowther » Sun Aug 27, 2017 2:21 pm

Dare I say it?... The misfire has been cured. Running the electronic ignition from an ignition-switched 12V, bypassing the ballast, has cured it! It is sweltering up here today but the Scim has taken it in his stride.
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Out and about
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New and proud owner of "Scimba" ('72 SE5a).
Learning slowly and driving quickly...

Crowther
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Scimba - Back in the game

Post by Crowther » Sat Nov 11, 2017 3:35 pm

Small job today - fit the original steering wheel in place of the Mountney jobby that was in the Scim when I bought him. Despite being a larger diameter wheel the original sticks out further so there's a little extra wiggle room for my beanpole legs. On the down side I can now see the instruments properly so I can no longer use "Honestly officer, I had no idea"...
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Looking legitimate
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New and proud owner of "Scimba" ('72 SE5a).
Learning slowly and driving quickly...

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