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This is a high-output hairpin (6-phase) alternator built as a direct replacement for Delco 10DN, 10SI and 12SI units on most 1963-1985 GM vehicles. Hairpin design produces more output at idle and runs more efficiently than a conventional alternator, and JS uses premium bearings plus a dual-plate rectifier with 12 heavy-duty diodes for better cooling under heat and load. It is a one-wire turn-on: a single lead from the supplied pigtail to any ignition-switched 12V source switches it on and off with the key. It suits car audio, marine and racing builds that need strong idle output and heat tolerance, but the smaller 45 mm pulley means you must fit a half-inch to one-inch shorter belt.
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This is a hairpin-style high output alternator, commonly called a 6 phase unit. It produces more output at idle and is more efficient than a conventional alternator. It is built for high-demand uses such as car audio, marine and racing.
It has premium bearings to withstand high engine rpm. A dual plate rectifier with 12 heavy duty diodes improves cooling, so the unit can handle high heat.
It directly replaces standard Delco 10DN, 10SI and 12SI alternators and installs on most 1963-1985 GM vehicles. It turns on with one wire: connect the provided pigtail to any ignition switched 12V+ source, and the alternator switches on and off with the ignition. The motor swap version comes with a 45 mm pulley, which requires a belt 1/2 inch to 1 inch shorter.
