Re: 1984 C10 4 pin brake switch question
4l80e needs 0v on the switch when the brakes are applied. Some switches work the opposite. Just throw a meter on it. If you have the wrong one, I have the correct part listed in my build (pic and part #), a few pages in.
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'66 Short Step / SD Tuned / Big Cam LQ4 / Backhalfed /Built 4l80e / #REBUILDEVERYTHING 
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