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I bought my FD in June 1992. I always opened the hood for cool down when I got home.
Even so the original engine harness was crap when I rebuilt in 1999. Don't forget that the stock ecu did not turn the radiator fans on until over 100C and the crowed engine bay had poor air flow. I replaced both the engine and coil pack harnesses.
Since then I have had all the cooling/air flow/ecu mods to make the engine bay happy.
The newer harnesses were also made of better material. They are still in greater shape today at age 9 years that the originals were at 7.
The other main harness you missed was for the cooling fan relays. Mine got water in them when the car was being painted back in 2003.
Back then Mazda still had the cooling system recal kit for about $75. It had the little black box (behind the ecu), a couple of small hoses and two harnesses. This was a great deal!
This is what is on the label: N3A1-18-SEO, Fan Recall Kit
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