Broken light switch and a frozen hub (85 Testarossa)

I could usually jog the light stalk/switch to turn on and off light but it just gave in now and is stuck in parking light whatever is turned or twisted.

According to information in the cross-ref thread I am ordering a Lancia part (176314180) and hope to fit it. My plan is to identify, cur and transfer the Ferrari contacts as they are quite different from what I see on Lancia stalks.

First problem was a frozen steering wheel hub, in short I tried oil, cold shock, heat but whatever I did it was stuck. I used a puller but the force destroyed the hub to a point where I may be able to straighten the top cage.

I have found a few vendors that sell the hub but does anyone have a link or info about potential "cross references" on the hub? The hub is not splined, it is a single "slot" that is slide onto. I will be using some antifreeze oil-grease when I mount it the next time.

The only special tool needed was the ring nut socket at 28 mm, I got it from a UK specialist. I had to use a "strongarm" to release the nut it was mounted with a lot of torque.

Below is a photo summary showing the white rotating spindle that was split.

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And the last few images with contacts for reference when I get the Lancia.. Image Unavailable, Please Login Image Unavailable, Please Login Image Unavailable, Please Login

 

Thanks but I'll try to convert the Lancia piece, its already ordered.

Now on the hub, there is bad news. I've gotten 3 responses so far about the part no longer available.

Somewhat "good news" , Luisi still make the adapter for their steering wheels and it may be fine while searching for a salvaged hub. I'll order a Luisi one so that I can move the car around.

https://www.volantiluisi.it/categoria-prodotto/mozzi/

 

Thanks, I will contact them.

For the reference, in case anyone get the same problem, here is the part: Luisi (boss/adapter/hub) S2403 for Testarossa and F40.
As seen it has the big single "spline" (forgot what it is in english) it is not like regular splined hubs but its the one for the TR.

Supposed to be this one but will post real photos when I get it from Italy.

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Got the parts and tried to use the Lancia piece but after 2-3 hours trying all cabling combos I recon:

• Lancia stalk has significantly less cables going to the loom
• Lancia stalks wiring is of smaller diameter than the Testarosssa wiring
• There is a difference in the mechanical part of the wiper switch(brass parts) and I could not get intermittent to work

I ended up carefully drilling out the four brass "rivets" around headlamp "switch/housing" and swapping the lever w/cam and surrounding plastics over to the old "Ferrari stalk".

Secured the housing with 3 small diameter bolts and nuts and a small self tapping screw for the last rivet since this one is kind of hidden inside the housing. Works like a charm.

At approx $140 the small plastic cam is expensive but at least the indicator is the same and perhaps quite a few parts from the wiper side also can be used in case something brakes.


Over to the Luisi hub/boss. This piece is perfect fit, it even comes with new screws. The only challenge is the ring securing the horn button, you will have to work this one a little, I ended up modifying it slightly to make it work. This piece is a fine alternativ to the expensive / out of stock Momo piece if you ever need a new one.


NEW LANCIA STALK
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IDENTICAL IN SIZE AND NUMBERING, LANCIA IN THE BOTTOM
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MUCH LESS WIRING IN LANCIA STALK AND SMALLER DIAMETER ... HMM
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LUISI HUB - BOSS - THIS ONE IS WELL WORTH THE 45-50 EUROS
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BRASS RING FOR HORN IS INTEGRATED
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HILL ENGINEERING SOCKET - 28 MM (FOR 85 TESTAROSSA), GBP 45 AND A NECCESSARY TOOL
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LUISI HUB BLEND IN AND LOOKS ORIGINAL (BLACK SHRINK PAINT)
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The plastic part may be somewhat better "formulated" now but yes I, it's bound to break again in 2045!

 

Yes, mine is working as expected after the "transplantation".