Turn signal switch

[RollyTG]

My turn signal switch (indicator switch?) is, like most of them I'm sure, broken. The plastic canceling apparatus is missing some pieces. I think there are some other little components missing too. Can any of you offer me the benefit of your experience with this problem. Do I just fork out the $200+ for a new one, or is there a more economical solution? Is the same part used in other models - maybe XJ6 or such? Thanks.

[cass3958]

The part number for the switch assembly on the early cars is C25257 and on the laterS Types and the 420 cars C25555.
The XJ6 series one part number is C35091 so not the same so I would assume without checking them all that the part number is just for the S Type and 420.

I would suggest a second hand unit would be cheaper but the plastic does degrade and all second hand units are likely to have the same problem brewing that you have at the moment.

[RollyTG]

Thanks Rob. I will just bite the bullet and order a new one. It's only money.

[Glyn Ruck]

Make sure you get the later switch. Some earlier units were non self cancelling.

[RollyTG]

Thanks. I've ordered C25255, which according to Barrat is the correct one.

[Glyn Ruck]

That's the self cancelling type!

[RollyTG]

I have received the new switch. It looks somewhat sturdier than the old one, but the wiring is not identical. The new one has a black wire where the old one does not. Electrical stuff is something of a mystery to me so this is going to be a learning experience for me. Can anybody offer an opinion as to why the old one does not have a black wire and maybe suggest what I should do with same when I install the new switch into the car? Thanks.

[John Quilter]

On my 3.8S wiring diagram the switch shows two wires that go to ground. On Lucas wiring diagrams black is usually ground wires.

[Glyn Ruck]

Black are ground wires. Wiring colours can be inconsistent. Best to wire by function. Early versions had fabric insulation.

Indicator switch.JPG (45.09 KiB) Viewed 1545 times

Indicator - Copy.jpg (83.24 KiB) Viewed 1545 times

Indicator sw1.jpg (320.13 KiB) Viewed 1544 times

See here for detailed S Type wiring diagram.

http://www.jagstyperegister.com/images/ ... g-page.jpg

[RollyTG]

Thanks Glyn. I am making progress learning to interpret the wiring diagram. My new switch looks just like your picture, but I don't have the white plastic ring part that looks fairly essential. I might have to get onto Barratt's about that. My old switch has two cloth wrapped wires from what appears to be the headlight flasher part. they are black under the cloth. One of those goes to a double purple wire in the harness - ah, I see it now. in the diagram the light flasher is shown in a separate part of the picture. Progress.