Do you know what kind of wire and fusible link is needed that comes off the solenoid? I believe mine is burnt out from being to close/ touching headers. I have the same issue as 85 high minus the gauges not working, mine do, the dash light just doesn't come on with the headlight switch. I have tested the hot wire coming to my headlight switch and there is nothing. I do have turn signals front and back.
Yeah, that all makes sense. And, since power to the line side of the T/L CTSY fuse is supplied by the same single fusible link - in addition to the exterior lighting/courtesy and panel lights being out, you should also not have:
1. Horn
2. Cigarette lighter
3. Dome light
4. Cluster mounted clock - if installed
The panel, courtesy & dome/cargo lighting will all come back when you renew the link.
Now to your actual question - refer to the dwgs below:
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A fusible link is nothing more than a wire that is at least 4 gauge sizes smaller than the circuit it protects. However, it's covered with a special insulation that is designed to swell up when the copper conductor inside it becomes overheated. It doesn't necessarily have to be burned completely to cause the insulation to distort.
GM sizes wire using the metric standard (IDK why). According to the dwgs above, the particular fusible link that feeds the circuits in this case is classed as 1 square millimeter in cross-sectional diameter. That area is not exactly - but very close to - the cross sectional area of a #16 AWG conductor. That AWG rating is embossed on a plastic ring - it should be still be visible. If not you'll have to trust me.
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They are always on the shelf at any autoparts store. Here is one from O'reilly's that lists for $4.49:
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Here is the standard repair procedure - nothing more than making two butt splices in your case:
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