I fought a similar problem with an 87 B2 after trying everyone's suggestions with no luck I finally located the problem. It was corroded connectors on the rollover switch that is under the carpet on the passenger side footwell.
I had the same problem with a Bronco II, drove me nuts for a while. It turned out being the fuel pump shut off switch connections being corroded. Replaced the connectors and switch and cured the problem.
I worked at an alternator shop for about 5 years before I reached retirement. I have taken many of the fancy dual battery isolators on RV's and replaced them with heavy duty 100 amp continuous duty solenoids to cure the charging and starting problems the seem to develop over time. If a solenoid...
Been dealing with Bronco II's for many years ( I'm down to 4 now) One of the most elusive but common problems I ran into on the fuel system was the emergency shut off switch beneath the passenger side carpet. The connectors will corrode from damp carpet and raise the line resistance to the point...
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