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I have noticed an annoying issue on my '94 (4th gen) Honda prelude. The digital petrol and temperature gauges appear very faint when starting the car. After about 5 mins they brighten again, only to fade once more a few moments later. This repeats throughout driving.

I've checked the instrument light dimming switch, and its fine (on full).

Would anyone know what could be causing this?

We've had a bit of rain here lately, could that be affecting it?

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Is there an auto-dimmer turned on somewhere? –  hillsons Jan 24 '13 at 22:47
    
@hillsons I dont think so. It also dims right down to the point were it is only barely visible. –  MeltingDog Jan 24 '13 at 22:51
    
How do other lights behave? Is it possible they all dim and brighten in unison? Does the effect occur on idle and/or if you press accelerator pedal? –  Krom Stern Jan 25 '13 at 9:15
    
@KromStern All the other lights are fine. The effect doesnt seem to be related with the engine speed, though it does seem to have a 'warm up period' of about 5mins where it is completely blank. –  MeltingDog Jan 27 '13 at 0:36
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1 Answer

Sounds like just worn out electrical components. My experience with this is the digital dashes in the 80s Nissan 300ZXs. The flux/residue left on the circuit boards corrodes over time and the corrosion eventually shorts some connections, causing a multitude of symptoms.

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