Help with electrical problem rocky 1990

Just purchased for hunting vehicle and drive around on short trips, but when turn head lights on the tail lights go out, think maybe it is in the turning signal comp. so looking for replacement.

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Do they go out completely or just very dim.
Last time I had an issue like that, i pulled out the dimmer switches and sprayed them with contact cleaner.

Lights go out complete, going to replace the complete assembly. will keep post hope to do pic soon, very few DIA’s in south eastern USA… other than wrecked or parts