Help cooosing Alternator

[kgrantkey]

 I have two that will bolt right up and prefer to use one of those due to less work,  Down the road I'll go back thru the thread and choose a quality upgrade. But for now I want to get my truck running around the block enough to break it in and see how it does,  Got the engine and tranny installed last night. I started raining so I hurriedly hooked the battery to the starter and used 1st gear to pull it a few feet into the basement,

 

Now that I'm inside I'm not in a big hurry but I]m gonna show you the two Nissan Alternators I have and ask If either has a built in Regulator. If so That's the one I'd like to use because I;m really unsure of my external regulator.  I will also show it.

 

By the way this is a 76 ( mostly) 620 pickup. Many will recognize me by the number of threads I've started recently,

 

 

I also know their are a couple of wiring changes to the external regulator hook-up. Maybe a link to that part of the job too?  Or if it's simple enough a brief description.

 

The larger of the two may have come off a different Nissan, like a 280 or 240....maybe a 200sx.  I think I purchased this when I realized I was having trouble with the voltage reg. 

 

At the same time, I can't remember my battery running down with the smaller of the two alternators when it was hooked up, but that's been a few years ago and the trips were very short.

 

1st my voltage reg........

 

Now my smallest alternator .....

And the one that may be off of a later model than 76......the center one...

Now it by itself....

 

So that's all three of them.  I'd have to change pulleys on the last one, I believe it;s a GM and has a serpentine belt.

 

 

Any advice.   I know I can always go with the smaller Hitachi although both bolt on and I have belts for both.  If I go with the smaller one I could probably tall if it's charging in less rim than it took to write all this shit up.

 

Thanks in advance for any help.

 

 

[ggzilla]

The small one is stock 620. Plug & play. Get that truck up and running!

[kgrantkey]

The small one is stock 620. Plug & play. Get that truck up and running!

 

 

I wouldn't even ask the question if I were sure my voltage regulator were working.  That is the voltage regulator in the 1st picture I'm holding isn't it?

 

 

Well there is one sure fire easy way to tell.

[banzai510(hainz)]

yes that is a volt reg your holding.

plug the small one with the black grill in.

 

canyt tell if those are burnt solder joints on that volt reg.

 

the bigger alt will have soem issue hitting the idler arm