This is for "general" electrical discussions. Audio, security, remote start, and power accessories should go here, since they don't seem to fit anywhere else. Not for diesel-specific (like glow systems), or gasoline-specific (like ignition systems) topics.
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They're each 12 volt, 4 blades, about $5 apart, different colors, and their OEM numbers are 1 digit apart. The RY39 is rated at 30A and the RY228 amperage is never given. I asked both Standard Motor Products and Intermotor and got crickets. Other than appearing strikingly similar, does anybody know the real difference twixt the two?
'87 Isuzu pickup 2.3 gas, 5spd, 4WD