Just discovered that the passenger side indicators are working on my Mk 2 S, but the driver's side aren't. What is the likely problem/solution?

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1970 Cooper S SPO41

If it's both front and rear then I would be looking for a bad connection on the indicator stalk bullet connector plug.

Thanks. Where will I find the connector bullet you refer to? Have been fiddling around at the back of the speedo. Any chance I could have dislodged a relevant wire there?

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1970 Cooper S SPO41

Next to the steering column. Just follow the wiring loom coming out of the indicator stalk. The old bullet connectors probably have a high resistance connection due to corrosion.

Thanks again, think it's the green/white wire I should be looking for? If there is a bad earth at the dashboard indicator light would that also cause both the driver's side indicators to fail to operate?

On a separate, but related note, both gauges (water temp, oil pressure) fail to light when lights are switched on. No problem with the lights in the speedo and fuel gauge. Have replaced the bulbs, but still no joy. Any ideas?

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1970 Cooper S SPO41

Check gauge bodies are well grounded to the speedo housing.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

Yes Green/White should be drivers side indicators

The dash indiator globes are inline and are not earthed themselves. The reason the dash indicator globe is not lighting up is because there is either no power to the circuit or no circuit to earth.

Might be time to have a look at the wiring diagram, trace the wires and break out the multimeter.

Update on the indicator problem. Changed the bullet connection, still no joy. However the rear driver's side indicator does glow (very dull), but not flash, as does the panel light (also very dull). The driver's side front doesn't do anything. Interestingly, when the passenger side indicator is activated, everything works well for that side. Except that very occasionally instead of the passenger side panel light flashing, the driver's side glows (not flashes) briefly before switching back to the correct side. Any ideas/solutions?

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1970 Cooper S SPO41

Install a temporary earth to your rh side rear light cluster and see if things improve.

Have a read of my post dated Nov04 2020 (Indicator Issues). I just had a quick read of my post and there are similarities.
My problem ended up being a broken connection on the positive feed to the flasher.

Thanks Fritzie, will take a look

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1970 Cooper S SPO41

Update on the indicator problem, now resolved. Issue was a burnt front indicator globe. Moral of the story being for me to look for the obvious next time rather than assume something more sinister

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1970 Cooper S SPO41

Yesterday I was assisting in fitting a new loom into an 850. All went well until we were almost finished when testing the indicators which were working fine. With the indicators working we then turned on the lights resulting with the RHS parking light going brighter and the indicator going very dim. LHS ok. Any thoughts. Thanks Jim.

Install a temporary earth from the light fixture at the RHS rear. Run it from the fixture to the battery earth and check for results.