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Re: Does anyone know anything about 20dn alternators?
Heavy truck/bus alternators. Externally regulated (same plug connection as any non-regulated early Delco alternator), use the finned electronic regulator. As the earlier posters commented, be sure of the voltage, there were many versions of these things. They are capable of very high charging rates at low r.p.m.'s, so if you do use one be sure to adjust the voltage regulator accordingly. Any late-60's Chevy or GMC heavy duty truck manual will cover these.
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1967 GMC CM-2500 Camper Cruiser, 351E V-6, NP 435 4 speed, Dana 60, and factory A/C. 2012 GMC K-3500 WT regular cab, 6.0L Vortec, 6L90.
Last edited by Bob B.; 04-26-2025 at 01:56 PM.
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08-29-2016, 11:18 PM
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