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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.



#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

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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

#260 G8KeaPoR

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Posted 01 May 2018 - 11:55 AM

The problem is most people do not know how to properly aim their headlights! First the hid bulbs may be centered a little different than the H4s throwing the aim off, or the aim may be off a little to begin with. With the halogens it may not be as noticeable, so when you add 300% more light it makes a big difference. As most people know as you get older, you need all the light you need, so I have HIDs on all my cars and trucks, and they are properly aimed to put the light on the road, not up in someones eyes, and they are 6000K Daylight color, not that stupid blue or purple that is trendy, but puts out less useable light. Being an ex proffesinal driver for most of my llife, I believe in safety and having as much visability as possible at highway speeds at night.

Another thing, it's a misconception that HID draw more power, they draw less than the typical halogen, another reason I use them. All my Datsuns have all leds and hids to reduce load on the alternator, my heater no longer slows down when I turn on the head lights with the wipers on.

I tried the relay and heavier wire thing on a 280Z I had a few years ago, and it made no difference, next tried a 80 amp GM alternator, still had dim lights!

Do your research before bad mouthing a product, also they are not that expensive, I just paid $60 for a conversion for my 1200.

Resurrection but sorry I couldn't help myself as this is a HUGE pet peeve of mine.  The actual problem is that HID projectors and halogen h4 projectors aka Fresnel lenses are not the same nor do they have/use the same cut off. HID cutoff looks like an lightning bolt sitting on its side where as a halogen cutoff is a greater than sign eating the floor. (the floor is greater than _______!)  Anyway having the wrong projector or worse no projector causes the HID light beam to disperse rather than remain focused.  This creates glare regardless of how it is aimed insuring that everyone coming the other way is blinded and that you are actually getting less light and therefor can see less EVEN IF in your mind you think you are seeing better...  Yes it is mental.  If a conversion is done properly (of which 99.999999999999999999999999999999999999999999999999% are NOT done properly.)  You will get a focused beam that you can actually properly aim and not have any of the glare problems.  Sooo.  Unless you have conversions with the proper HID projectors in the housings then contrary to your belief that they are properly aimed you are actually blinding all oncoming traffic.  (The you or your being anyone with a conversion and not being aimed at the person I quoted.  I just had to set the context.)


I hate when people go cheap on repairs or modifications.  If you were just going to light your money on fire using band-aid fixes you might as well have given it to me.