Federal Plus 2 Wiring Diagram

[Ceej]

I have a 1970 (69 build) Federal Plus 2. It's a late early car, kind of 'S' (driving lights), kind of not (4 gauges,early steering column, dynamo, RB106, etc.). IOW, the quintessential 'whatever was at hand at build time' kind of car.

My shop manual has 7 wiring diagrams in it, none of which are what the car has, which is the aforementioned dynamo, RB106 2 fuse harness. I've searched but have not been able to find a diagram that matches my configuration. Can anyone show me where to find one hereabouts, elsewhere, or otherwise share one?

Thanks in advance!

Chris

[Bud English]

I think I might have the one you need. It's marked Elan +2 (RB106 control box) Sept '67 - March '68. The sheet number is LSL 140. The year isn't quite right but it has all you asked for; 2 fuse, RB106, 4 gauges, but no driving lights. Do you have that one?

NOTE: My book has eleven wiring charts and diagrams. Not all workshop manuals were made to the samw spec either.

[Ceej]

Hello Bud,

No I don't have that one. And by the sound of it, it's close, or certainly closer than any of the versions in my shop manual. Are you able to post it here? I'd go private but I'm too new for off-board communication.

I do have driving lights, a part of the 'S' part of the car. As part of the work to be done those will be going away. I've always felt that they (along with the dreaded Stromberg Bump) ruin the elegant, curved simplicity of the original design.

[Bud English]

Here it is in both JPG and PDF form. Both enlarge well and are very clear when downloaded.

[Ceej]

Belated thank you Bud!

I noticed that the diagram shows the negative battery terminal going to the solenoid. This leads me to several questions:

Is the diagram for positive earth cars?
If it is for positive earth, what other aspects of the wiring harness will be different than negative earth?

All help appreciated.

Thanks.

Chris

[HCA]

My assumption from your post is that you have a negative earth? You imply this but do not state the fact.

As far as I know all Elans with a dynamo generator were positive earth. But this needs confirmation.

It could be that your car was originally positive earth, but had a modern transistor radio fitted requiring negative earth, and had the dynamo re-polarised to negative earth.

Generally the wiring diagram will be the same (substitute - for + and + for -) but I cannot remember if some of the instruments had to have their connections reversed.

[Ceej]

Here it is in both JPG and PDF form. Both enlarge well and are very clear when downloaded.

Hi Bud,

I spent some time enhancing the file you posted. I've colo(u)rized it, filtered out all of the scanning noise and sharpened the text. I *think* it's accurate,although some of the text was a little fuzzy. I was a little puzzled by simultaneous RG and GR color references. I moved forward with documenting them (differently) on the basis that they are in fact different. Perhaps someone w/ more knowledge will come along and clarify.

I find I can follow the wire paths more quickly and accurately w/ the addition of color, and the editing exercise certainly has helped expand my understanding of the electrics.

While editing I came to understand that this is a positive earth diagram. My limited understanding (gained almost entirely by reading threads here) is that there are only limited differences between positive and negative earth looms.

Thanks again, and...

Cheers!

Chris

[Bud English]

Nicely done Chris. As for RG and GR, The first letter is the colo(u)r of the wire color and the second is the tracer (stripe) color. RG is a red wire with a green tracer. GR is green with red.