Hi, I'm not sure if this is the right place for my problem, but I'd sure appreciate any help. Here goes: I just crammed a 5.9L Cummins into my '55 chevy truck. I pretty much have everything doing ok, but I am pretty much learning as I go. Now I am stuck. I can't figure out how to get the alternator to charge. I have no idea how to wire the voltage regulator/ alternator/ battery combo. When I pulled the engine out of the bus it didn't have a clip on the voltage regulator, it was just 4 wires crimped onto the little plugs, and the same on the alternator. On the regulator the output thingys are labled "I" "A" "S" and "F". Originally I guessed the it was "I"gnition, "A"lternator "S"omething, and "F"ire? I'm pretty sure I was wrong. On the alternator there are also 4 leads. One is marked "N" I am assuming for "N"egative, another is marked "P", guessing "P"ositive. Both of those are pretty good size posts, and am pretty sure the positive goes to the battery and the negative to ground, but have no Idea about the two smaller ones. They are the same size and shape as the ones on the voltage regulator so I am thinking they go on there somewhere. I would greatly appreciate any help, thanks in advance, Kenyon.

 

Hey 55 sounds like a nice conversion I,m sure somebody will reply soon it's to dark right now but i'll trace mine after work if no one has answered. ps fill in your signature[click on user cp] helps people know which year engine tran etc. Yes this is the right place if it's a cummin's engine [lot's of conversions here too]you made have the wrong forum depending on which year the engine is hence filling in the sig but then we can redirect you to correct one on this site

 

Regulator:
I = Ignition = Switched Power
A = Armature = 12v, generally split with wire from alternator to battery.
S = Stator = to "S" post on Alternator
F = Field = to "F" post on Alternator

Alternator:
P = Positive = wire to battery, split to "A" on regulator
N = Negative = Ground, often unneccessary, as these are grounded through the case.
The other two should be "S" and "F", look closely, and connect to regulator accordingly.