Routing of wiring loom 750 Sprint - Alfa Romeo Bulletin Board & Forums
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post #1 of 24 (permalink) Old 12-29-2011, 02:22 PM Thread Starter
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Routing of wiring loom 750 Sprint

I forgot how the routing of my wiring loom was in my '58 Sprint. Does anyone has drawings and pictures? A good readable wiring scheme is also very welcome (the one in the owners manual is not very clear)

And what about the fusebox? The scheme shows 8 fuses but most 750's have only 6? How to divide the two remaining best over the 6 fuses?

Thx,

Erik

Sprint 750B 1958, Bertone GTV 2000 1972, Spider 2011 1750 Tbi Sport Gone: Giulietta 2.0 Lusso, 75 1.8, 156 2.4 JTD, 156 SW 2.4 JTD, GT 1.9JTD, Spider 2.2 JTS

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post #2 of 24 (permalink) Old 12-29-2011, 05:30 PM
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If you have the original wiring from 1958, I would advise you to throw it away and have Lionel build you one. I converted mine to 8 fuse. It's all in the lights when you go from 6 to 8. A new wiring harness is cheap insurance to prevent a fire. I have heard of cars recovering from crashes and roll overs but never one engulfed in flames. There aren't enough tears to put out the fire.
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post #3 of 24 (permalink) Old 12-29-2011, 05:41 PM
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Hopefully this will help you out, even though it has 8 fuses. If you need a higher resolution version, PM me and I can send you what I have via email.
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Late '57 Giulietta Spider Normale

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post #4 of 24 (permalink) Old 12-29-2011, 08:02 PM
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Quote:
Originally Posted by divotandtralee View Post
If you have the original wiring from 1958, I would advise you to throw it away and have Lionel build you one. I converted mine to 8 fuse. It's all in the lights when you go from 6 to 8. A new wiring harness is cheap insurance to prevent a fire. I have heard of cars recovering from crashes and roll overs but never one engulfed in flames. There aren't enough tears to put out the fire.
I could not agree more. To the extent that we just put a new harness (which Lionel made) in our '57 a couple of months ago. We also changed it to 8 fuse. The thought of a fire was just too disturbing, and the thought of electrical "problems" just too aggravating.

Cheap insurance.

Scott

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post #5 of 24 (permalink) Old 12-30-2011, 09:00 AM Thread Starter
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Hi Uncle and Scott,

thanks for the advice about not using the old loom. There was not much loom left so I decided long ago to buy a new one. I bought in 2004 a new loom from AutoSparks (I believe Stuart aka AlfaZagato used the same in his SVA). Unfortunately it didn't come with a scheme or routing drawing so I have to do it from memory and pictures from other cars.

I believe the loom goes to the back along the right side of the tunnel and then goes up behind the battery then to right rear light and then along the back panel to the left rear light then up to the registration lights.

At the front it goes up on the left side of the bulkhead then inside to fuse box and instrument panel. Then to the right through the bulkhead for the right headlamps and Ignition coil.

From the left of the bulkhead to the Control box and left the front headlamps.

When i looked at the old remains I discovered that there was already a 8 fuse box.

I will try to draw a colored drawing according the scheme in the owners manual dated 8/58.

Pictures taken during installation of a loom will be very welcome


Thx,

Erik

Sprint 750B 1958, Bertone GTV 2000 1972, Spider 2011 1750 Tbi Sport Gone: Giulietta 2.0 Lusso, 75 1.8, 156 2.4 JTD, 156 SW 2.4 JTD, GT 1.9JTD, Spider 2.2 JTS
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post #6 of 24 (permalink) Old 12-30-2011, 02:49 PM
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Erik, Your description is close, except that both headlights and the ignition coil come from the left side (as do all the engine compartment wires, with the exception of the starter). These wires go past the control box and across the front of the car.

The rear section comes out of the right side of the bulkhead and goes to the back of the car, with the starter and main ground being the only wiring to branch off on its way down the bulkhead.

I hope that makes sense.

Scott

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post #7 of 24 (permalink) Old 12-30-2011, 03:33 PM Thread Starter
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Thanks Scott,

The only thing I am not sure of now are the roof lights. Are they going through the right roof pillar?

Sprint 750B 1958, Bertone GTV 2000 1972, Spider 2011 1750 Tbi Sport Gone: Giulietta 2.0 Lusso, 75 1.8, 156 2.4 JTD, 156 SW 2.4 JTD, GT 1.9JTD, Spider 2.2 JTS
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post #8 of 24 (permalink) Old 12-30-2011, 04:38 PM
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Quote:
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Thanks Scott,

The only thing I am not sure of now are the roof lights. Are they going through the right roof pillar?
The wires for the roof lights run through the left front pillar, from the door switch in the drivers door hinge area. They then go across the roof from left to right, under the headliner.

After carefully using the old wires to pull the new wires down the pillar I realized that was not the best way to access both the door switch and the pillar. It is much easier from the back of the front wheel well, by removing the splash panel. This allows access to both the interior (via a small hole by the fuse box) and the pillar going up to the roof.

Scott

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post #9 of 24 (permalink) Old 12-30-2011, 05:00 PM
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Also, for anyone interested, a friend recently loaned me a large- 60cmx45cm original wiring diagram. It is for a Spider. It is very similar to a Sprint- the only real difference is the roof/dome light and related switches. I made 7 additional full size copies. I would be happy to mail them for the cost of shipping material+price of copying(not cheap for that size)+postage. Let's say $10+shipping for a rolled version (not folded). $8 total including shipping for a folded one. PM me if interested.

Scott

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Last edited by skiwalk; 01-03-2012 at 11:28 AM. Reason: added price for folded version
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post #10 of 24 (permalink) Old 12-31-2011, 08:06 AM
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Quote:
Originally Posted by skiwalk View Post
Also, for anyone interested, a friend recently loaned me a large- 60cmx45cm original wiring diagram. It is for a Spider. It is very similar to a Sprint- the only real difference is the roof/dome light and related switches. I made 7 additional full size copies. I would be happy to mail them for the cost of shipping material+price of copying(not cheap for that size)+postage. Let's say $10+shipping total. PM me if interested.

Scott
Those come included with Lionel's package and are laminated in plastic
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post #11 of 24 (permalink) Old 12-31-2011, 08:23 AM
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Quote:
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Those come included with Lionel's package and are laminated in plastic
Yes, I got one from Lionel with our harness. We tried to use it- it was nearly impossible to read the color names and the attachment codes on it- even with a magnifying glass. We ended up using the small one in the back of the owners manual until we got this one. This one is MUCH easier to read. It is clearer and a fair amount larger.

I would like to add that the harness itself was/is very good quality. Considering the individual qualities of each of these cars, it installed with very few difficulties. Again, a testimonial to the quality of the workmanship. I would buy (and likely will buy) another one from Lionel in the future.

Scott

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Last edited by skiwalk; 12-31-2011 at 08:53 AM.
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post #12 of 24 (permalink) Old 12-31-2011, 08:59 AM Thread Starter
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I am drawing now a color version of the diagram. I will print to a PDF when it is ready and make it available for every one.

Sprint 750B 1958, Bertone GTV 2000 1972, Spider 2011 1750 Tbi Sport Gone: Giulietta 2.0 Lusso, 75 1.8, 156 2.4 JTD, 156 SW 2.4 JTD, GT 1.9JTD, Spider 2.2 JTS
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post #13 of 24 (permalink) Old 01-01-2012, 06:27 AM Thread Starter
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Here it is. Had to use a very light shade of blue for the white wires. Hopefully this shows good enough on white paper. I put the wire colors on layers. When layers are enabled in your PDF reader you can show and hide them easily. Original size is 841x594mm (A1) or about D size (34x22 Inch) in Imperial units.
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File Type: pdf WiringHarness-Layout.pdf (37.0 KB, 291 views)

Sprint 750B 1958, Bertone GTV 2000 1972, Spider 2011 1750 Tbi Sport Gone: Giulietta 2.0 Lusso, 75 1.8, 156 2.4 JTD, 156 SW 2.4 JTD, GT 1.9JTD, Spider 2.2 JTS
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post #14 of 24 (permalink) Old 01-01-2012, 07:44 AM
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Erik, I think that you have the matter well sorted out. I have used the AutoSparks looms on five occasions (three Spiders and two Sprints) and they have been very good. I don't anticipate that, with the wiring diagram which you now have, you will have any installation problems. Best of luck!
No relation to the Company.

Stuart
'57 Spider Veloce, '57 Lightweight, '60 SZ, '76 2000 Spider. '60 Sprint
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post #15 of 24 (permalink) Old 01-01-2012, 07:57 AM Thread Starter
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Hi Stuart,

Uncle already wired me up with a lot of very good sketches of the loom. To know that you have succesfully installed already five cars with the same product is another great encouragement. Did you make pictures during the installation on the Sprint?

and I forgot... Best wishes for 2012 for all of you!

Sprint 750B 1958, Bertone GTV 2000 1972, Spider 2011 1750 Tbi Sport Gone: Giulietta 2.0 Lusso, 75 1.8, 156 2.4 JTD, 156 SW 2.4 JTD, GT 1.9JTD, Spider 2.2 JTS
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