The Triumph Dolomite Club - Discussion Forum

Bom dia todos

My gear box is leaking, just a littel. I start to take the gear box cover of, first the bottom carpet.......and then this cable (black/violet) with plug.......

See pictures

Has any one an idea........?

My Dolly is 1973-06, LHD, 1850....


Looking forward to your comments and informations.......

It looks like the lead to the tandem brake master cylinder warning light. Should be in the engine bay on the bulkhead where the brake pipes converge in the union.

I agree it is the plug for the brake failure warning system see attached photo that I took of one that I took off one of my cars.

Richard the old one wrote: ↑Wed Mar 19, 2025 8:17 pm I agree it is the plug for the brake failure warning system see attached photo that I took of one that I took off one of my cars.

On a RHD car, that wire to the PDWA switch would be black. But a RHD 1850 of that year would only be single circuit brakes, not dual, so no PDWA at all.

But it certainly LOOKS like a PDWA plug, Many early LHD cars had dual circuit brakes, complete with PDWA and who knows how they made the LHD looms? In Lucas wiring, Purple colour indicates a fused permanent live feed and Purple/black usually indicates a switched live. As in the interior light and horn wiring. Whereas the PDWA switch in a RHD car will have an ignition live feed and a switched earth.

Steve

I understood all LHD cars had tandem brakes?

My car is from 1973 and has only one break line system.......I was surprised to read the answers....telling me it is warning light!!! .....some times is better not dig deeper.

Any way thanks for your comments and informations it helps me

Até breve

Carledo wrote: ↑Wed Mar 19, 2025 10:09 pm On a RHD car, that wire to the PDWA switch would be black. But a RHD 1850 of that year would only be single circuit brakes, not dual, so no PDWA at all.

But it certainly LOOKS like a PDWA plug, Many early LHD cars had dual circuit brakes, complete with PDWA and who knows how they made the LHD looms? In Lucas wiring, Purple colour indicates a fused permanent live feed and Purple/black usually indicates a switched live. As in the interior light and horn wiring. Whereas the PDWA switch in a RHD car will have an ignition live feed and a switched earth.

Steve

It's black/purple.

Jeroen

xvivalve wrote: ↑Thu Mar 20, 2025 8:01 am I understood all LHD cars had tandem brakes?

In NL and other countries maybe also from July 1 1967 all cars had to have a tandem system. Otherwise no type approval.

Jeroen

73Iceblue wrote: ↑Thu Mar 20, 2025 1:40 pm My car is from 1973 and has only one break line system.......I was surprised to read the answers....telling me it is warning light!!! .....some times is better not dig deeper.

Any way thanks for your comments and informations it helps me

Até breve

That will be why you have a plug connected to nothing then!

If Jeroen is right, he should be as he lives in Europe, then your car will have started off life with dual circuit brakes and a PDWA valve, which this lead would have connected to. However, there was a time a few years ago when, even in the UK, the dual circuit master was effectively unobtainable (Yes, I know the early export dual master was different to the later UK one, but they were both unobtainable) So, it's not surprising if your car got fitted with a single circuit master by simple lack of choice some time in the past. No tandem master, no PDWA (no way to make it work) and therefore nowhere to connect the lead, so just hide the wire somewhere!

Steve

Hi Steve

thanks for your comments / observations. Yes you talk right, there for is no need for me to fix double circuit even if I fit an O/D gearbox etc.....funny no?

Thanks every for helping