HELP 88 Cutlass Supreme Turn Signal out

g0thiac

G-Body Guru
Sep 6, 2020
755
63
Any idea where to find those schematics?
Service manuals. Although some members might share their copies if you ask haha.
 

John Wm. Zick

Apprentice
Supporting Member
Jun 10, 2021
78
18
Winter Haven, Florida
Hydroplaned the other day, hit the guardrail slow enough not to dent the body but knocked something loose in the light system. My right turn signal and left run light now don't light up. Whats the process here? Check bulbs first? Fuses? How do the lights detach so I can get in there? Where are the fuses? New to cars and have a bit of a time crunch to get this fixed so I can register her.
I would start with the fuse and then replace the bulbs, If nothing, then get out yer meter and follow the wires back to the fire wall.
 

383_StealthRam

Greasemonkey
Supporting Member
Dec 29, 2016
179
63
You don't mention if this is a 88 Rear Wheel Drive Cutlass (G Body) or 88 Front Wheel Drive Cutlass (W Body) but since this is a G Body forum, I assume the former. I have 1987 RWD G Body Olds Cutlass factory wiring diagrams attached here in hopes they will help you track down your issue(s). I wouldn't think they differ much from 1987-88? If you need some other missing info, just lmk and I'll be happy to add to it.

These are taken from Section 8A of the factory service manual. I included the entire section 8A Index so if you see something else you need (for example) Power Antenna, you can ask for Sub-section 151-0.

The numbering is for each subsystem of electrical systems, (ie; 110 is Exterior Lights, then by page within numbered 0-11).

Best of luck in your diagnosis.


Section 8A Index 1987 G Body 0.jpg


Section 8A Index 1987 G Body 1.jpg



12-0 Light Switch Details.jpg



12-1 Light Switch Details.jpg



12-2 Light Switch Details.jpg




12-3 Light Switch Details.jpg


100-0 Headlights Composite.jpg




100-1 Headlights 4 Door.jpg



100-2 Headlights.jpg




100-3 Headlights.jpg



110-0 Exterior LIghts 2 Door.jpg



110-1 Exterior LIghts 2 Door.jpg



110-2 Exterior LIghts 4 Door.jpg

110-3 Exterior LIghts 4 Door.jpg





110-4 Exterior Lights Info.jpg



110-5 Exterior Lights Info.jpg



110-6 Exterior Lights Info.jpg



110-7 Exterior Lights Info.jpg



110-8 Exterior Lights Tail Rear Marker License 2 Door.jpg



110-9 Exterior Lights Tail Rear Marker License Opera 4 Door.jpg



110-10 Exterior Lights Info.jpg



110-11 Exterior Lights Info.jpg



112-0 Backup Lights.jpg




112-1 Backup Lights Info.jpg



112-2 Backup Lights Info.jpg
 
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383_StealthRam

Greasemonkey
Supporting Member
Dec 29, 2016
179
63
Those are much nicer than mine. What book/magazine are those drawings from ??? Jack & Oleta in Winter Haven, FL.
Factory Service Manual

These are considered "wiring diagrams," not really "schematics" as they break out all the electrical systems and link them together for individual reference. Most of the aftermarket manuals give monochrome schematics where everything is crammed into one page and difficult to read/follow.

HTH
 
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John Wm. Zick

Apprentice
Supporting Member
Jun 10, 2021
78
18
Winter Haven, Florida
Factory Service Manual

These are considered "wiring diagrams," not really "schematics" as they break out all the electrical systems and link them together for individual reference. Most of the aftermarket manuals give monochrome schematics where everything is crammed into one page and difficult to read/follow.

HTH
I'll do some research. I pulled all the wiring out of my 83 Cutlass; and have almost got the rewiring done for a street strip car, but it's been a real treat trying to get the wiring out of the Haynes manual. Thanks for your response HTH. JZ
 
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