Do these alt conversion kits work?

[Custom/Ten]

Originally Posted by enaberif

I put a CS140 into my 74 truck. It took 1 simple adapter from Napa which has two versions. One version has a resistor the other version does not and the adapter cost me all of $25.

Alternator brackets may need to be tweaked as well depending on what alternator you use but a CS130 should be a direct bolt in.

ECH EC80 = No Resistor
ECH EC82 = Resistor

We'll that sounds pretty easy, what's the resister for?