Weird wiring fault

[2tmike]

This has me really puzzled.....
I'm slowly going through my '90%' finished Plus 2 that I bought recently and whilst trying to sort the electric headlight conversion issue it has, I thought I'd work through all the electrical items that didn't function and hopefully tick them off a few at a time. So far I have :
Engine starts and runs (bonus !!!) and tacho shows a reasonable display
Windows work
Wipers and washer work
Main and dip beams work
Sidelights work ....but see later
Reverse lights work
Hazards work, all four flashers
Battery condition gauge works.
No other gauges seem to work but the tank is maybe very low with fuel
Left turn indicators work but, and here's the crazy bit ....
The right turn signal illuminates the rear indicator bulb - no flashing and also illuminates the right front sidelight !!!!
Most other things are still inoperative.
The car's a late 130 plus 2 non federal and I can't see from the wiring diag any miss-connection route that would cause this . I'm a little loathe to pull the dashboard at this stage as the car is booked in for a chassis change soon but I guess it will come to that unless anyone can suggest a possible cause?
Many thanks in advance for your ideas !!!!!!

[gjz30075]

I'm not that familiar with a +2 but does your car have a DB10 relay? My Sprint had similar
fault and after decades of chasing it, it was the DB10 at fault.

[2tmike]

Not sure what a DB10 relay is but the lighting circuits on this one seem to be protected with thermal cutouts ....

[EPA]

Usually when other lights glow it’s because the normal path to earth for the intended light isn’t functioning properly, in other words the ground/earth connection is poor or none existent.
The ground connections for individual light clusters usually end up at a common point which creates an alternative path through the filaments of the bulbs not in use, usually much dimmer than normal. I guess this could also reduce the total current through the flasher unit which is important to its operation.
Hope this makes sense as I tested positive for the dreaded Covid the other day and whilst feeling much better the brain still seems to be a little befuddled.
Ed

[Bigbaldybloke]

Mines a very early plus 2 so much different wiring so I can only make suggestions. You have proved that the actual indicator lamps and hence earths all work correctly from the hazard warning. Hence it seems it’s the indicator switch or indicator flasher that is your problem, as once you get outside the cabin area all the wiring and lamps are the same for both indication and hazard warning, so to me it looks like you are going to spend time upside down peering into the back of the dashboard, and I’d start with the flasher unit, but that’s only intuition not actual experience on this specific version of wiring. Also check out any capacitors fitted for radio suppression.

[EPA]

Before getting too deep into this, I would first double check that the hazard lights are all flashing with equal brightness and look closely at the adjacent lights to ensure they aren’t also flashing or glowing dimly.
Ed

[elanfan1]

Clean the earth points before anything else.

[Bud English]

The motto for all Lotus cars over fifty: "Simplify, then add lightness and clean the earth points before anything else"

[pharriso]

The motto for all Lotus cars over fifty: "Simplify, then add lightness and clean the earth points before anything else"

Like it & agreed!!