You're spot on!
The indicator relay is not totally sealed and, although the rubber cage holds it 'sealed-side up', water still gets in. After a while corrosion causes a short inside. I took mine off, levered the plastic end plate out, scraped the terminals clean with a knife and washed the interior out with WD40. Then, I dried the WD40 off the end plate area, and used clear silicon sealant to totally seal the unit. It worked fine, but the worse case scenario would be to get a new relay. They are at least cheap and available from Halfords!
Hope that helps.
Stig
"Only one other animal on the planet wears shoes, and only because we grab them by the legs and hammer them on." Christopher McDougall
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