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One Wire Alternator for my 77 620


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#1 joelyjoeljumpin

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Posted 08 May 2008 - 08:39 PM

So I am thinking of switching over to a GM style one-wire in my 77 620 . I have replaced the Alternator twice with rebuilt ones from Napa and it still isn't charging . I have read through all these posts and still can't find a good answer for which alternator is best to use . So sorry for starting a new thread with some of the same questions . I could have sworn I had seen a tech article somewhere on swapping in a 100amp GM alternator in an old Datsun .

#2 ggzilla

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Posted 08 May 2008 - 08:46 PM

Why not use a Nissan one-wire alternator? At least from 1980 they have been available.
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#3 datzenmike

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Posted 08 May 2008 - 08:55 PM

Here ya go:
http://forum.ratsun....thread.php?t=74


Why not use a Nissan one-wire alternator? At least from 1980 they have been available.


What were they on? I've just never seen one. All 720s have the T connector and two other wires, '80-'81 200sx have the same. The '84 Maxima I looked at was the same as the 720.

#4 ggzilla

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Posted 08 May 2008 - 09:10 PM

Only one wire of the T-connector is needed...
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#5 joelyjoeljumpin

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Posted 14 May 2008 - 11:17 PM

Thanks for the info and link to that thread .

#6 banzai510(hainz)

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Posted 15 May 2008 - 05:09 AM

I have replaced the Alternator twice with rebuilt ones from Napa and it still isn't charging

Maybe it isnt the alternator!!!!!!

the regulator maybe.

Buy the Beck Arnely brand if buying from Napa.
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#7 joelyjoeljumpin

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Posted 20 May 2008 - 08:20 PM

Screw it I found the alternator i'm going to use my original alt in the truck when I bought it was a 14231 internally regulated unfortunately my dumb *ss replaced it with a 14105 externally regulated unit . DOH . So I am gonna replace that with a 14301 for a 78-81 510 its a 60 amp internally regulated but looks to have the same mounts and plug setup . Allready pickup up a water inlet from a 280ZX and put it in . Will post how it works out later on this week .

#8 joelyjoeljumpin

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Posted 03 June 2008 - 09:17 PM

Bolted in with no problems same price as the 35 amp unit . Had to run a longer belt though . It is a bit close to the lower radiator hose though .

#9 datzenmike

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Posted 04 June 2008 - 06:59 AM

Probably close to the grease fitting on the idler arm too. I used the three bolt block mount from a 720 as well. It lifts the alt. slightly up and away from the idler and hose. The 60 amp is slightly larger in size.

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Posted 05 June 2008 - 01:19 AM

I'd been looking into buying a gm one wire 100 amp for my truck too. I was thinking about how easy it would be to run it on the opposite side, under the distributor. To me it would simplify everything and the need for a different water neck, steering issues, hoses, etc. It's just too crowded over there. I was under the impression that you just remove the external voltage reg, and run your wire off the alt to the battery, isn't it that simple?

#11 Bleach

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Posted 05 June 2008 - 06:22 AM

you did what I had done on my 620. Bought the late 70's 200SX (510) 50amp alt which was bumped up to 60amps. Use the 200SX belt like you did. Plugs right in.
The 280ZX alt is huge and still only 60amps.

If you need more amps you can look up info on a Saturn alternator install.

I took a couple long zip ties and went around the frame and the lower rad hose. I sinched it just enough to gently pull the hose a little further back.
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#12 joelyjoeljumpin

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Posted 09 June 2008 - 10:35 PM

I took a couple long zip ties and went around the frame and the lower rad hose. I sinched it just enough to gently pull the hose a little further back.


Did the same thing didn't really feel like draining all the coolant to trim the hose to make it fit better .

Oh yeah my alt is about a 1/2 inch from the idler arm and the grease fitting has all ready been taken out and plugged . And I filed the top alternator adjustment mount to get the belt a bit tighter .

60 amp should be more than enough for this little 620 for now . :D

#13 Pacific coast Datsun

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Posted 10 June 2008 - 03:50 AM

Joey im having the same alt. issues on my 74 620. Installed a new [reman] alt & it keeps killing my batteries. Sounds like i need to go the way you did. What parts store did you buy the 60 amp alt. at & what brand was it? Thanks & do you have any pics of the install?

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#14 joelyjoeljumpin

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Posted 10 June 2008 - 05:42 PM

Check your voltage regulator if it is bad though it would probably be cheaper to switch to an internally regulated unit and jumper the wires of the voltage regulator like a bunch of guys on here posted in other threads .

Mines a Napa brand reman under the NAE line code part #14301 . Had to be ordered but only took one day. Didn't take any pics sorry . I could snap a couple of the new alternator in there though.

Stay away from Beck Arnley in my experience working for napa the NAE line of Starters and Alternators is really good quality .