What Delco-Remy alternator is this/ how do I wire it?

[AKcruiserfreak]

Hey guys,
Disclaimer, This alternator was already hooked up to a 1977 2F I pulled. I'm just curious if it's worth keeping and if it's really a one wire hookup like it appears.
If I can't use it, I hope I can use the alt from the F motor that was in this 40 to begin with.
Here's a couple of pics:

 

[DSRTRDR]

the original F motor alternator was externally regulated by -guess what- an external voltage regulator

an internally regulated alternator, like the later models had, does not need that external regulator

you have an external regulator at hand for that earlier alternator ?

 

[AKcruiserfreak]

the original F motor alternator was externally regulated by -guess what- an external voltage regulator

an internally regulated alternator, like the later models had, does not need that external regulator

you have an external regulator at hand for that earlier alternator ?

I do have everything necessary to switch back to the F alternator including the bracketry still on the F. It's probably in my best interest to switch back to the F alt. I suppose as I won't have to worry about the amperage burning up the stock amp gauge, or red-necking the wiring harness. I am still curious, however, how many Amps this thing outs out and how it is supposed to be wired.

TK

 

[spotcruiser]

That looks like a typical 10SI or 12SI alternator, that will run anywhere from 35 to 100 amps or so. There are a bunch of versions, based on the original car in which they were installed, so it's difficult to state exactly what you have without part numbers (it can be difficult to find numbers, as some of them were stamped on the case in ink and may be worn off). You can readily buy parts and rebuild them and they're pretty reliable. There should be no problem running it if it's in good shape or you rebuild it so that you know what condition it's in.

The ampacity of an alternator only tells you the max rated continuous capacity of the alternator. The alternator will only supply the current drawn by your truck electrical load. If you have a stock truck with the original loads, and have the original fusible link protection for your harness, a larger-than-stock alternator will not burn up your ammeter. If you add large loads, like a winch, you don't want to supply it through your stock electrical system.

Edit: Just noticed the alternator fan in the photo and I'd say it's a 12SI.

 

[spotcruiser]

Here's a good picture of the Delco connections that I just found in a previous post from Poser. If you're installing this engine in a stock truck, you can jumper a couple of connections at your stock regulator connector to supply the ignition connection for this alternator (Caveat: I'm not familiar with your vintage of truck, so I'd have to look at an old wiring diagram to verify if that applies to a '68-71 truck, but I'd assume that it does).

 

[Godwin]

Here's a good picture of the Delco connections that I just found in a previous post from Poser.

Would you mind posting a link to Poser's post?

 

[spotcruiser]

Here's the thread. I didn't read through the whole thing, because there's really a lot of crap in it, so I'm not sure it's valuable for anything but that connection diagram.

https://forum.ih8mud.com/40-55-series-tech/576875-ac-delco-12si-terminal-wiring.html

Would you mind posting a link to Poser's post?

 

[AKcruiserfreak]

Awsome! Thanks for taking the time to post that info spotcruiser! I might just keep it!

TK