9two8

I,m installing a Momo D35 wheel on my 928, that I picked up on ebay with 7005 boss, everything fits great, but I,m having issues with the horn.
When I connect the horn button to the black wire and the wheel is snugged home, the horn wont work. If I bend the brass connector slightly and push the wheel down the horn goes off continuously.
When I get the brass connector not to trigger the horn the horn button wont blast the horn.
I did notice the boss kit came with another extra wire with terminals both ends and ther is a male connector on the mounting ring that the momo button fits into, I,m sure I read somewhere that the 928 only needs the black wire connected, so I was wondering why is there this other one in the boss kit.

As always any info is appreciated

Ken
80 928 S
5 Speed

UK

9two8

..., bump, any takers ?

Ken
80 928 S
5 Speed

UK

Brett928S2

Hi Ken

I had HUGE problems trying to get my Momo horn to work (same problems you have) ,,,, eventually I thought I had it fixed and I thought I had stopped it going off at random times...

Then it started going off whenever I turned the wheel to the right...

I gave up and mounted it on a separate button.... Yellow button on plate to left of wheel >>>>

[IMG] Uploaded with ImageShack.us[/IMG]

All the best Brett

Mrmerlin

you may have to use the other wire to ground the hub to the shaft mount,
then the hub to the horn button.
Put the wire already installed onto the other pin on the button.
Adjust the TSwitch so the brass tab is just touching the rear of the horn ring, not by bending the tab,
you have to remove the lower cover of the column to see the TS mount screw

9two8

.., Thank,s for the help/info.., I found a how-to off Bill Ball, he mentions that only the black wire is connected ?, The setup is basically the same as my horn button although the wheel is a different design.

http://www.billsworkshop.com/P928S4/momo/momo_club4.htm


Ken
80 928 S
5 Speed

UK

Jim M.

I just installed a Momo wheel in my GTS. Needed both wires and it worked the first time and every time.

9two8

.., so it must need a separate earth lead, there is one in the box, but after reading Bill ***** post he quoted that only the black wire was required ? does this wire connect to the tag on the metal ring that the horn button fits into.., and if so where does the other end of the earth lead locate for it to earth out?

Sorry for my ignorance but there were no instructions in the box, hence me asking how-to

Ken
80 928 S
5 Speed

UK

Jim M.

In most DC electrical systems there is always power to the component. Activating the switch usually only provides a ground. The black wire your refering to is (I assume) the power wire. The second wire is the ground to the hub adapter. The horn button completes the circuit to the ground, blowing the horn. IIRC some Momo horn buttons have a contact on the edge to ground directly to the steering wheel and then to the hub and on to the car chassis. Yours may not or it may be defective. My suggestion is to use the second wire to ground directly to the hub.

9two8

.., thank,s, my horn button has a copper coloured solid wire on the outer edge, which you have to push in while fitting the horn button into the wheel, so that is making a good contact there is also just one connector on the back of the horn button, now when I put the wheel and boss onto the splined shaft and push it home, the horn will blast all the time, if I move the brass contact slightly it does,nt, connecting everything together ie wheel bolted to spline and horn connected the horn wont work.
Thanks again for your help.

Ken
80 928 S
5 Speed

UK

Jim M.

Do you have 12 VDC at the black wire? When you touch the black wire to a ground does the horn blow? When you push the horn button is there continuity between the copper coloured solid wire and the spade connector on the back of the button, and is it every time or only when pressed a certain way? Is there continuity between the copper coloured solid wire and the spade connection when the button is not pressed?

It sounds like the button may be defective.

9two8

..., thank,s once again for your perceverence, I,ll check out what you advise and get back.., good point re the horn button, I also have some doubts ?

Ken
80 928 S
5 Speed

UK

9two8

An update, and thank,s for the advice.., the horn button and original horn wire checked out good, only one wire was needed, horn earthed through bridge type solid wire on side of Momo horn button.
The problem was the brass rub strip that contacts the bottom brass ring of aftermarket hub. Basically I removed a portion of it that had been previously repaired, although it was working ok with the original wheel, it would,nt with the Momo wheel. I fashioned a new one, fixed with a small self tapping/panel screw, to hold it securely where it should be, and the other end I drilled a small hole and a suitable round headed bolt with two nuts for adjustment to secure.
It was trial and error at first, with the bolt head sticking out too much, and the horn honking as soon as there was any pressure put on the steering column shaft nut, so after suitable adjustment ie the round head of the small bolt just touching the hub brass circular contact, the horn now works as intended.
The bolt head is a sort of flat dome so that it does,nt create too much direct rubbing contact to cause a groove, then I applied some light grease to both contact points.
I guess time will tell, although it turned out well in the end, and the wheel looks good, feels good, I can get in and out of the car easier, and see the logo,s on the column stalks for the first time !!

Ken
80 928 S
5 Speed

UK