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Re: 1987 s10
dash lights off an on would be either worn headlamp switch or a loose wire/plug
but i vote for the light switch
common wear item, they dont last forever, little copper ocntacts in them
also wiring plug spade connection in these vehicles are known for melting due to overheating due to loose connection in them
seenit happen many times
the most recent was one of the fuseablelink spades in the junction box at the firewall that supply power to the fuel pump system and to the headlamps
was melted badly
i by passed it and it was good as new, fired right up and headlights work again
this was in a 94
good luck
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I also am user fastr68 here- Randy
-'54 F100 302 C-6 -'57 F100 -'57 Bel Air HT 307 4spd '57 210 HT 4dr 265 3spd -'68 corvair monza convertible w/ PG -'79 C-20 -'80 K-20 -'82 K-10 SS -'82 TRANS AM WS7 HT 5.0L TH350 2400 stall, blue/blue, level III PMD cloth PG hood -'85 Elky SS 310ci 2004r fully restored 2008 -'85 Riviera 5.0L 116k auto blue/blue parting out,92 s-10 2wd 4.3L --'97 cavalier RS 2.2L, 5sd -'05 18ft car trailer
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