Lotus Elan

Indicator light in speedo problem

PostPost by: bcmc33 » Sun Oct 11, 2009 5:33 pm

I have just noticed this week that the indicator light does not flash when the indicators are working. When the indicator arm is moved (in both directions) the light flashes once only and then dies.
The last time I drove the car in the dark - probably April/May the light was working perfectly.

I never really look at the light as I have a buzzer to let me know that the indicators are working - but I would be interested to hear what the problem is before I go out and buy a new flasher unit.
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PostPost by: leifanten » Sun Oct 11, 2009 11:52 pm

Could it be as simple as a burned out bulb? Otherwise I would put my chips on earthing/connectivity.

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PostPost by: bcmc33 » Mon Oct 12, 2009 9:03 am

Leif,

I hope you're not a gambler. Bulb and earthing are both good.
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PostPost by: paddy » Mon Oct 12, 2009 11:03 am

I think it's the flasher unit, and you need either a replacement or just to clean out the cobwebs and brighten the contacts.

The flasher unit drives the indicator lamp, and the wiring from the flasher to the lamp and the lamp itself are obviously OK, so the entire circuit is OK apart from the flasher unit. I can't really see how it can be anything else. (Famous last words ...)

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PostPost by: bcmc33 » Sun Oct 18, 2009 12:15 pm

I'm still at a loss on this one. :? :?

Bought a new flasher unit and the result is the same. :oops: :oops:

Has anyone any ideas??
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PostPost by: pamitchell » Sun Oct 18, 2009 1:59 pm

Indicator arm contacts are worn, loose?
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PostPost by: john.p.clegg » Sun Oct 18, 2009 2:03 pm

Brian

Are your indicators working,I think it's the current flow through the indicators/flasher that powers the on/off?

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PostPost by: bcmc33 » Sun Oct 18, 2009 2:05 pm

John,

The indicators work perfectly.
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PostPost by: 69S4 » Sun Oct 18, 2009 2:19 pm

bcmc33 wrote:I never really look at the light as I have a buzzer to let me know that the indicators are working


Are you using the std thermal flasher unit and if so how have you got the buzzer attached to it? What happens if you unplug the buzzer?

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PostPost by: Frank Howard » Sun Oct 18, 2009 2:20 pm

Brian,

I'd disconnect the buzzer and then see what happens.
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PostPost by: bcmc33 » Sun Oct 18, 2009 3:36 pm

Disconnecting the buzzer was my first thought and action - but it makes no difference.

To eliminate any possible car interference I did a bench test with both flasher units and the dash indicator bulb only flashed once while the main bulb flashed as normal.

The mystery continues.
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PostPost by: alexblack13 » Sun Oct 18, 2009 8:27 pm

Try a test wire from a good proven earth point to the speedo. Just hold it on to test... Or, use a meter for continuity test. No earth means no indicator light. I think!

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PostPost by: bcmc33 » Sun Oct 18, 2009 9:02 pm

The car and bench earth connections are perfect, Alex.
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PostPost by: paddy » Sun Oct 18, 2009 9:47 pm

Brian,

First of all, sorry if my advice led you to buy a new flasher that turned out not to solve the problem.

If I understand correctly, you're saying that you have replicated the entire circuit on the bench, away from the car, and it exhibits the problem with either flasher unit.

In that case, is there any part of the circuit that is not new? Could it be the indicator lamp itself? I've no idea how that might be the problem, but what's left? Is the supply voltage OK?

It's quite mysterious.

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PostPost by: bcmc33 » Sun Oct 18, 2009 10:28 pm

Paddy,

Most frustrating.

I've tried creating a new circuit in the boot space with a supply direct from the battery and a link to the rear indicator. I've tried four different bulbs including an LED for the panel light and they only flash once even though the three side indicators continue to work perfectly.

In sheer desparation I shall attempt to persuade a friend to test both the flasher units in his MGB tomorrow.
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