I reckon you're on the right track. There are some really good electrical cleaners in spray can available from the likes of Jaycar, although I'm not sure if they are in SA? The stuff I'm thinking about cleans, but also has some pressure behind it to dislodge dirt etc. Has a plug in nozzle.
Lot of mucking about, but maybe try and clean any connections you can get to at the back.
It does sound like a cross signal with something or a lot of things "on" which is confusing things.
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XG Falcon Ute, XE Fairmont Ghia & BA Mk II Falcon SR
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