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how to install gm 105 amp alternator


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#1 bonvo

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Posted 09 May 2010 - 05:00 PM

alright as you guys might know i now have a 105 amp alt in the car and this is how i did it


things you will need

1: gm 105 amp aternator (comes out of newer astro or truck)
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2: 3 feet of wire any color about 16 gadge

3: solder heatshrink and electrical tape and big "eye" type end

4: gm alt plug as shown
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5: double v belt alt pully
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6: chunk of steel 1/4 inch thick by 1 inch wide by 7 inches long

7: a few nuts bolts and washers of varying sizes

8: dye grinder with a cut off wheel plasma cutter somthing to cut steal acuratly with, a drill with a 1/2 inch chuck and a 1/2 inch drill bit

alright the first thing your gonna do is your going to remove the serpentine belt pully that comes on the alternator your not going to be using it i used a big pair of channel locks and the apropriate sized socket do with this as you please

next install the twin v belt pully again i used channel locks and socket

remove original alternator and place the new one in its place you will notice that the lower mounting is totally wrong we will deal with that

posistion the alternator so that both mounting points are close to the block and run a bolt threw the existing belt tentioner and the upper mount on the alternator
you can see in this picture that the belt lines up with the outer grove on the pully when bolted to the stock tentioner (note it may not line up exactly if its a little off bend the tentioner bracket a little)
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next turn your attention to the lower mount you will see that the lower mount on the alternator and the mount on the block look like they will never work (new alternator compared to old one for referance:
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first thing your gonna do is take your 1/4 inch steel peice and cut it in half leaving you with 2 chunks about 3 1/2 inches long drill two 1/2 holes one on each end the holes should be about 3 inches center to center
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grind down the edges so the corners arent shap
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place brakets on the original alt mount and blot them down loosly this creates the type of mount that is needed for the new alternator but it is wider then the mount on the alternator you will need to make spacers we used some tubing we had floating around i would give you measurements but each factory alternator braket is different this is the only part you will have to measure and cut yourself

after you have made the spacers run a long bolt thew the lower mount of the alt and the newly created mounting brakets
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you may need to buy a new belt (i did) so you will have some adjustment but with this set up the farther out on the adjustment you go the farther away the alt gets from cutting the lower rad hose

now we move onto wiring this is a breeze

looking at the stock witing there is the T plug the white wire with the small eye on it and a black wire with a small eye on it tape the T connector and the black wire back out of the way take the white wire and put a bigger eye on it so it goes over the pole on the gm alt

next solder about 3 feet of wire to the wire on the gm plug and plug it into the alternator

run the wire along the stck wiring harness up to the voltage regulator unplug the regulator and cut the white with red stripe off the connector and connect your new wire from the gm plug to it (only reason its a butt connector here is because i ran out of soder
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stuff the rest of the voltage regulator plug out of site

and badda bing badda boom this is the end result
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if you have any questions dont hesitate to ask i can answer them

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#2 metalmonkey47

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Posted 09 May 2010 - 05:59 PM

Nice! Going to do this with mine now.

...seems to me we are being held hostage by these candy-ass pussy, limp wrist, hanky twisting, girly-man, cry when Forrest Gump's mom died, crystal gazing, Om chanting, sandal wearing, whiny voiced, oh I broke a nail, fucks.


#3 Unclejesse88

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Posted 09 May 2010 - 07:55 PM

you might want to rethink using the stock charge wire (white) with your new 105 amp alternator. Search online for amps vs. wire gauge and you will probably find out that the stock wire is way too small for 105 amps. If you do upgrade your charge wire, remember to install the correct size fusible link in the new wire.

#4 bonvo

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Posted 09 May 2010 - 09:28 PM

i already did that everything point to it should be fine its already something like a 10 gauge and its not going far

the first rule of Ratsun is you don't talk about Ratsun... no wait thats fight club.....


....the first rule of Ratsun is PICS OR BAN! :fu:



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its like pikachu cuz its always his go to, the ol relaiable, looks cute kicks ass on the reg. and the 610 is charizard.... when ya really need to lay down some shit. lol - skib

 


#5 fisch

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Posted 10 May 2010 - 05:55 AM

Nice one B! Thanks for taking the time for the writeup!

#6 banzai510(hainz)

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Posted 10 May 2010 - 06:02 AM

Nice Fluke meter

wish the photos where clearer!

be honest Im more confused.
I see now 1 wire, 2 wire and 3 wire GM connectors from the back of those alternators.

by the old volt reg I thought you just jumper the wht/red with wht blk and wht with the yellow at the connector.

uncle wrote about upsizing the wire.
I assume you just routed the new 10gauge wire from output of alternator to the starter lug/battery cable. also putting a bigger EYE on the stock wht/red wire to the output of the alternator

doesnt matter now, You got it done.
Throw on some Weber sidedrafts, Rising Sun hood.... call it good

#7 bonvo

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Posted 10 May 2010 - 10:34 AM

fisch: i figured it was a good upgrade so others might want the info that and ive been wanting to do a write up on something for a while

hainz: i wish my pictures were clearer to but all i have is a point and click that cant seem to focus when things are close the plug i have has the single wire going to the L terminal on the alternator my dad and i sat doe for a few hours looking at the wiring diagram for the 610 charging system and the gm alt we have and found this to be the best way the reason there are different plugs is for different cars different cars actually have a hook up for alt output from that plug so the computer knows what the alt is doing at all times

as for the fluke i was wondering if someone would notice my dad has had that multimeter longer then Ive been alive lol

the first rule of Ratsun is you don't talk about Ratsun... no wait thats fight club.....


....the first rule of Ratsun is PICS OR BAN! :fu:



http://community.rat...on-resurection/
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its like pikachu cuz its always his go to, the ol relaiable, looks cute kicks ass on the reg. and the 610 is charizard.... when ya really need to lay down some shit. lol - skib

 


#8 banzai510(hainz)

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Posted 10 May 2010 - 10:54 AM

I see old Fluke meters at work.
Wait till you see a old anolog Simpson 260 meter!!!!!!!!!!!!!!!

I learned on a 260 meter

http://www.simpson26...mpson_260-3.htm

When I saw a Digital I was scared!!!!!!!!!and avoided useing them.

sorry for the (jesse) Hijack(son)

Now the cheap Chinese made pocket meters are pretty acurate and under 20-30$ Its with in 2% accurate of the FLUKES I use also
Throw on some Weber sidedrafts, Rising Sun hood.... call it good

#9 metalmonkey47

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Posted 10 May 2010 - 08:39 PM

Hey, what engine did you do this swap in? L-series I believe?

...seems to me we are being held hostage by these candy-ass pussy, limp wrist, hanky twisting, girly-man, cry when Forrest Gump's mom died, crystal gazing, Om chanting, sandal wearing, whiny voiced, oh I broke a nail, fucks.


#10 bonvo

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Posted 10 May 2010 - 10:58 PM

Hey, what engine did you do this swap in? L-series I believe?


yes i bolted it to an l20b it shouldnt be much different for an a series though they use the same basic alternator stock

and i forgot to mention the alt is out of a 1999 gmc safari with a 4.3 v6 and rear air conditioning

the first rule of Ratsun is you don't talk about Ratsun... no wait thats fight club.....


....the first rule of Ratsun is PICS OR BAN! :fu:



http://community.rat...on-resurection/
http://www.build-thr...1/#comment-5259

http://community.rat...-bought-a-what/

 

its like pikachu cuz its always his go to, the ol relaiable, looks cute kicks ass on the reg. and the 610 is charizard.... when ya really need to lay down some shit. lol - skib

 


#11 SurgeL320

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Posted 11 May 2010 - 11:31 AM

Nice how to on this , but isnt the astro alternator around $300 though. I bought one for my parents van and it was ridiculously expensive
... Its probably something stupid


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#12 bonvo

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Posted 11 May 2010 - 08:10 PM

i have no clue i got the alt for free

the first rule of Ratsun is you don't talk about Ratsun... no wait thats fight club.....


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its like pikachu cuz its always his go to, the ol relaiable, looks cute kicks ass on the reg. and the 610 is charizard.... when ya really need to lay down some shit. lol - skib

 


#13 thisismatt

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Posted 11 May 2010 - 08:36 PM

Nice how to on this , but isnt the astro alternator around $300 though. I bought one for my parents van and it was ridiculously expensive

Look at, say, newer Tahoe alts. I see one on ebay right now for $100 buy-it-now with free shipping, 160 amp.

I have not yet begun to defile myself.


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#14 Charlie69

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Posted 12 May 2010 - 06:17 AM

Hi Bonvo nice write up! Just wondering if you could add a picture that shows the how tis works with the bottom radiator hose?

Is the ear bracket the same as the fonrt one you made?

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#15 bonvo

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Posted 14 May 2010 - 07:31 PM

Hi Bonvo nice write up! Just wondering if you could add a picture that shows the how tis works with the bottom radiator hose?

Is the ear bracket the same as the fonrt one you made?


the rear is the same thing i didnt post mesurments due to the differences in stock alt brakets but the only difference would be the spacer sizes as for the lower rad belt it clears well and with the new pivot point the tighter you make the belt the further away the pully gets from the hose and for those wondering there is no fan on it for a reason the alt has 2 internal fans

the first rule of Ratsun is you don't talk about Ratsun... no wait thats fight club.....


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http://community.rat...on-resurection/
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http://community.rat...-bought-a-what/

 

its like pikachu cuz its always his go to, the ol relaiable, looks cute kicks ass on the reg. and the 610 is charizard.... when ya really need to lay down some shit. lol - skib

 


#16 SICK620

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Posted 16 December 2010 - 11:34 PM

where did ya get the twin pulley thingy? What does it come off of? and what did your connector come out of???

#17 bonvo

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Posted 17 December 2010 - 12:21 AM

the twin alt pulley i found floating around the garage but you can pull it off of older gm trucks as well as any rotary as for the plug i think i pulled mine off a late 90s cutlass if i were you i would print the pic and take it with you to the yard that way you can just compare it and if you can take multiple plugs

the first rule of Ratsun is you don't talk about Ratsun... no wait thats fight club.....


....the first rule of Ratsun is PICS OR BAN! :fu:



http://community.rat...on-resurection/
http://www.build-thr...1/#comment-5259

http://community.rat...-bought-a-what/

 

its like pikachu cuz its always his go to, the ol relaiable, looks cute kicks ass on the reg. and the 610 is charizard.... when ya really need to lay down some shit. lol - skib

 


#18 bananahamuck

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Posted 17 December 2010 - 03:55 PM

I really like your use of things that are just laying around or because i had one.Posted Image I may be crazy but i try to teach my boys this whenever they work in garage,( even though they have cut up things i didn`t want cut up), but i think it will good in the long run when they take on a project like yours.

only bitch i got is you need MORE pictures of your handiwork.Posted Image

q-tip, on 06 Jul 2013 - 09:27 AM, said:

    I think they're the same casting for the housing its just whether it has a fan clutch on it or not, but don`t qoute me on that.

 

 

 

 

 


..........................I shall call it, narclops.



 


#19 SICK620

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Posted 17 December 2010 - 04:52 PM

got mine! life time warranty at schucks...... $90 ...... Going to go get some metal for my brackets right meow, Tomorrow going to the junkyard for connector and pulley....

#20 Jayden71

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Posted 17 December 2010 - 05:41 PM

What are you puttin it on Gage? The 620??

I'm a witless bastard.