If you look On the 86 alternator the number 1 wire comes from the key or a power source and the number 2 is the since wire which is hot all the time. with the one wire alternator those wire can be used for turning on dash board lights. The reason your lights dim I would think is because the pulley on the one wire alternator is larger than the 91 alternator. Most of the time on the one belt alternator the pulleys are much smaller and so the rpm is much faster, if this is the case you could get a smaller pulley for the 86 alternator, hope this helps.
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Today's Featured Article - Tractor Profile: Farmall M - by Staff. H so that mountable implements were interchaneable. The Farmall M was most popular with large-acreage row-crop farmers. It was powered by either a high-compression gas engine or a distillate version with lower compression. Options included the Lift-All hydraulic system, a belt pulley, PTO, rubber tires, starter, lights and a swinging drawbar. It could be ordered in the high-crop, wide-front or tricycle configurations. The high-crop version was called a Model MV.
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