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90 amp bolt in alternator on an L-series motor


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#241 datzenmike

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Posted 19 April 2017 - 11:21 AM

Room is at  a premium on the 520/521 and the 620 trucks. If you got the urge gato, re mount it on the distributor side where there's tons of room. There are threaded bolt holes over there. Just make a custom mount for it.


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#242 flatcat19

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Posted 19 April 2017 - 11:37 AM

I think I'll be fine. Not worried.

You can't hang if your nuts haven't dropped...it's physics


#243 datzenmike

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Posted 19 April 2017 - 03:15 PM

Truck alternators are small. Higher output are larger and hit the grease fitting on top of the idler arm.


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#244 flatcat19

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Posted 19 April 2017 - 03:17 PM

I have a KA alt already. There is barely a difference in size between the two. I had plenty of adjustment to go with the 620 alt.


I'll report back when installed.

You can't hang if your nuts haven't dropped...it's physics


#245 Charlie69

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Posted 19 April 2017 - 09:16 PM

Truck alternators are small. Higher output are larger and hit the grease fitting on top of the idler arm.

Not if you run a 1980 to 1986 720 chassis under your truck.  The steering gear box and the idler arm are on the outside of the frame making more room for alternators and AC compressors.


Here is my build link:
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http://community.rat...20-king-cab-dd/

 

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http://community.rat...20-king-cab-st/

 

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#246 flatcat19

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Posted 19 April 2017 - 09:18 PM

Then bring a 720 frame up here and get this 521 finished!!!

You can't hang if your nuts haven't dropped...it's physics


#247 datzenmike

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Posted 20 April 2017 - 05:52 AM

Not if you run a 1980 to 1986 720 chassis under your truck.  The steering gear box and the idler arm are on the outside of the frame making more room for alternators and AC compressors.

 

 

These two poets go together....

 

 

Room is at  a premium on the 520/521 and the 620 trucks. If you got the urge gato, re mount it on the distributor side where there's tons of room. There are threaded bolt holes over there. Just make a custom mount for it.

 

 

Truck alternators are small. Higher output are larger and hit the grease fitting on top of the idler arm.

 

The 720 truck alternators are like the larger diameter '70s Datsun car alternators. 50/60 amp output. I've tried both in a 620, they are not a good fit. By the time you get it positioned where you can swing it to tighten the belt it hits things. Had to install shorter belt first then mount the alternator. The KA alternator did look slightly smaller but I have not tried it in a 620 only my 710 sedan. I think they are 80 amp.


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#248 J's 620

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Posted 05 May 2017 - 11:44 AM

I would like to confirm that a Saturn alt. works in a 620. It's the cs 130. I bought it from an alternator shop, got a shorter belt, replaced the grease fitting on the idler arm with a grease cap, and used a turn buckle thingy as my adjustable mount. Also used the 280 zx water inlet and lower hose to give it some room. Fit is tight but doesn't hit anything. Does this help anyone? Yes I know, put it in a build thread.... and post pics. I don't have a computer so......

#249 J's 620

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Posted 05 May 2017 - 11:47 AM

Oh and I had to shave down the alt mount that bolts to the block a weee bit. Just so the holes line up.

#250 flatcat19

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Posted 05 May 2017 - 12:15 PM

Don't need a computer. I post everything from my phone including pictures.

You can't hang if your nuts haven't dropped...it's physics


#251 J's 620

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Posted 05 May 2017 - 01:23 PM

So I'm stupid. Damn.

#252 dude

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Posted 12 July 2017 - 03:17 PM

I installed the new Saturn alternator, that was the easy part. Only modification would be to the alternator bracket and find then head to AutoZone for a shorter belt. My problem is wiring, I can't get the wiring correct

IMG_20170712_180108_zpsngj5laep.jpg

IMG_20170712_180304_zpsbtghhl7h.jpg

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#253 J's 620

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Posted 12 July 2017 - 03:42 PM

This is on a 620? I just don't recognize what those terminals (or whatever they are called) are.

#254 J's 620

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Posted 12 July 2017 - 03:46 PM

Search for the internaly regulated alt swap. Theres info on a thread somewhere that tells you to loop some wires (short them to themselves) and join the choke heater wires on the carb. I have a 76, I don't know if it's exactly the same, because I have electric choke on the factory Hitachi dch 340. I will try to get some pics going

#255 datzenmike

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Posted 12 July 2017 - 04:55 PM

I installed the new Saturn alternator, that was the easy part. Only modification would be to the alternator bracket and find then head to AutoZone for a shorter belt. My problem is wiring, I can't get the wiring correct

IMG_20170712_180108_zpsngj5laep.jpg

IMG_20170712_180304_zpsbtghhl7h.jpg

IMG_20170712_180300_zpspagkw0ig.jpg

 

 

Can't tell what your vehicle is... 620???

 

Find the old external voltage regulator. Cut the plug off but keep the wires long. Join these two pairs of wires....

 

White/Black and White/Red

White and Yellow

 

Join and solder these two pairs of wires and wrap with electrical tape or better yet use heat shrink tubing on them. Remove the other wires on the plug they are not needed. Plug this plug back into the engine wire harness and you're done. Nice and neat.

 

Now is this a 620??? because there may be one more thing to do yet.


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#256 dude

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Posted 12 July 2017 - 09:36 PM

Yes, this is a 79 620. Appreciate the quick help guys, I've been knocking my head trying to figure this out.

#257 dude

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Posted 12 July 2017 - 09:57 PM

Here's my wiring diagram for my year, which one is the voltage regulator for splicing the wires?

https://www.dropbox....m_1979.pdf?dl=0

#258 datzenmike

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Posted 13 July 2017 - 06:19 AM

Ahhh, well it is already set up for an internally regulated alternator, just plug it in. '78 and up Nissan vehicles all had internally regulated alternators.


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#259 dude

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Posted 13 July 2017 - 01:57 PM

Awesome, thanks for the help