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Walmart has the OBD1 code checker for the Bronco for $30.00. It is the newer digital version. Real easy to use. I got the older one with the blinking light and beeper. Good investment if, like me, you don't want to mess with jumpers.
1988 EB Bronco - 302 - AOD - 3.55 Lim Slip 8.8- Manual Hubs and Transfer Case - BFG 32/11.5 AT - 209,000 miles