According to my sources, a plug and play wiring harness for an 85-92 Mazda pickup will plug into my Miata and let me play nice in traffic while towing my tire trailer... However, no one seems to carry such a thing anymore. The best I can find is a 93-96, which I am fairly certain is different.
http://www.gocurthitches.com/search_result.asp?Manufacturer=CURT+Manufacturing&vYear=1990&vMake=MAZDA&vModel=B+SERIES&Category=HITCH+WIRING&Description=T%2DCONNECTOR
foxtrapper, if ever I figure out where you are, and am in the area, I owe you a beer.
Well I'm at Carlisle this weekend, and it's going to be hot on Saturday....
Glad to help.