Newer vehicles have relays in the light circuits so the trailer lights can be fused separately from the vehicle lights. I don't know when GM started doing this, but our 2012 GMC Acadia and 2017 Silverado 2500 are both set up this way. Since your Haynes manual probably covers all years of the S-10, there's a good chance the wiring diagram doesn't accurately reflect your truck. If your truck has separate fuses for trailer and vehicle lighting, it must have some relays.
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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