mine is a denso 120 amp external regulated on the 440 truck (not sure what it is from/double groove pulley)



I have a denso mini (smaller than my denso120amp) from 88 van/double pulleys that is external regulated. not sure what amp?

IIRC they ditched the VR on firewall in 89-93

if it has a serp pully I think those are internal regulated

swing by an autozone and have them toss it on the machine and test it. that will let you know for sure.