Courtesy light or dome light(small interior light located on headliner) inside of car ,will come on when door is open
CTSY = courtesy lights, meaning dome and under dash lights.
CTSY fuse ChevyTalk FREE Restoration and Repair Help for your Chevrolet
The Internet, though, has a large number of web sites where
you can buy service manuals and schematics from bookstores,
publishers, and other collectors. Here is just a sampling of
what sites are out there:
Chilton Repair Manuals
http://www.chilton.cengage.com/
Haynes Publishing
Haynes auto manuals
http://www.haynes.com/
Factory Automanuals
http://www.factoryautomanuals.com/
search for : factory service auto repair manuals
Vintage Books
Vintage books com Rare used and out of print books
http://www.vintage-books.com/
AutoLit
http://www.autolit.com/home.htm
SOURCE: GMC Sierra 1994 The ctsy fuse .
Hi; I believe the cigar lighter is on that fuse and that was a problem on these vehicles.
SOURCE: I have a 1997 gmc
i had an old gmc diesel van,it would not like changing gears, thought maybe tranny trouble, & i changed the fuel filter,problem solved, turns out it wasnt getting enough fuel to change gears.maybe your fuel filter needs to be changed
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