I notice that even the headlight connector on my toyota has a waterproof cover, and the connector also has a smear of dielectric grease on it.
By contrast one of the main engine connectors on my citroen van has no cover, and is open to the elements. It's not surprising that the vehicle has a reputation for electrics issues. I've given the connector a spray of ACF50 which will hopefully improve my chances a little.
What would be even nicer is for manufacturers to make their plastic lens covers of material that does not degrade (so much) by heat and the sun, and can be separately replaced from the entire unit at a reasonable cost when required.
Sanding down and 're-treating' the surface to make them 'good as new' often is a short-lived 'fix' and, unlike in the US where the materials required are dirt cheap, they are quite pricey in the UK.
My Mazda3 has a cracked fron fog lamp lens cover (it still works) due to an errant stone hitting it, but only some dodgy-sounding East European 'sellers' on ebay sell the 'part' (sans bulb), which you need to jack up the front of the car and take the wheel well cover off to fit. My local dealership wants £150+ to fit a whole new assembly. In the 'old' days, this would've been a 5 min job taking off two screws and refitting a (glass) new lens cover, which would not be affected by sun damage as my headlight covers have been.
At least I can change out the headlight bulbs without much fuss, not that (touch wood) I've ever needed to as yet.
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