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The factory Volvo service and tech spec manuals may include information on collects earth / ground connections are. If not already, these grounds can form corrosion at the bonded contact (stack or ring terms under a both head atop sheet metal using a self tapping threaded or machine screw or bolt into an embedded fastener).
I hold the ring term and loosen and tighten the screw or bolt head. Use quick lithium grease blast or a few drops of Penetrox / NoOx / DeOx to stave off teh LOL cat danged corrosion so head lights are bright and the horn is loud and such.
May not cause or cure the instrument cluster dimmer control, yet lamps may glow brighter. Hope you got dim-able LEDs for your instrument cluster!
Some links for you:
Volvo 1800 Pictures and global register: Wiring
https://volvo1800pictures.com/wordpress/wiring/
(The entire site is Volvo 1800 Gold!)
http://www.v8volvo.se/mekartips/volvo/
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