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My fog lights and my side markers are not working. Are they on same fuse? If not if one burns out will the other stop working? 1990 Lexus ls400

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Have you checked that the bulbs are good?

I was told by my mechanic that it is common for fog lights on the early LS400 to stop working due to corrosion of a connection on a "fuse block" - or at least that was what my mechanic called it. My mechanic always got the fog lights working again by cleaning the connection at this "fuse block" about once each year during the last several years I owned my 1990 LS400. I never asked where this "fuse block" was located - whether it was the one in the engine compartment or under the dash but I would think that the one in the engine compartment would be the more likely suspect since it was exposed to the elements.

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