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Old 10-30-2012, 08:22 PM   #1 (permalink)
lt1fire
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Upgraded alternator

Fairly soon i'm going to need to upgrade my alternator in the truck.... 70 amps isn't nearly enough.

Wanting this because i'll be adding more, speakers and amp, GPS device, Inverters for camping, winch and most likely electric cooling fans.

I've seen quite a few of these around

http://www.ebay.com/itm/NEW-160-AMP-...bc4ad3&vxp=mtr

and reading through this thread it seems to fit with spacers
https://www.dieselplace.com/forum/sho...ght=headlights


Just wanting to know if there are any other options out there worth considering to swap in if they can be junkyard sourced.

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Still waiting to be installed: Badger Reman Injectors, Kennedy return line kit, Delco OPS, Leroy OPS extension, Leroy lift pump relay harness, Lubrication Specialist SS lines, new glow plugs
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Last edited by lt1fire; 10-30-2012 at 08:35 PM.
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Old 10-30-2012, 10:00 PM   #2 (permalink)
jdemaris
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Quote:
Originally Posted by lt1fire View Post
Fairly soon i'm going to need to upgrade my alternator in the truck.... 70 amps isn't nearly enough.

Wanting this because i'll be adding more, speakers and amp, GPS device, Inverters for camping, winch and most likely electric cooling fans.
There is no right or wrong here but . . . I regard the CS144 a better fit. It's much more common in junkyards, better technology then the SI, and it's also a better fit since it's smaller then the 22SI.

22SI is taller and wider then a 12SI. On the other hand the CS144 is almost the same footprint/size as the 12SI.

When it comes to power along the RPM curve, the 22SI and CS144 are almost the same.

A few things to consider. The 12SI on a 6.2 can charge 50-60 amps at engine idle speed. NOT the 20-30 amps as claimed in the post you cited. One reason why it charges that much at an engine idle speed of 800 RPM is the crank pulley ratio to the alternator pulley. Crank is 7 1/2" and the stock alternator pulley is 2 3/4. When the engine idles at 800 RPM the alternator is spinning at 2200 RPM. 12SI makes 40 amps at 1600 RPM and 55 amps at 2200 RPM (engine idle speed). That is plenty as it is.

Now - if you want more you've got belt slippage problems. That 2 3/4 inch single groove pulley doesn't grip well enough for a higher amp alternator unless you put on a large pulley. That gives more belt grip area but also less alternator speed.

If you want a bigger alternator, you've also got to slow it down - unless you've got serpentine belt drive or find a way to run dual-groove pulleys.

Here's the info from the post you cited:

"Simple facts:
10SI/12SI puts out between 20-30 amps at idle.
22SI puts out around 50 amps at idle.
22SI puts out an equal amount of amps as the 12SI at a lower RPM."

This is more correct:

12SI puts out 55 amps at engine idle speed with stock pulley
22SI puts out 80 amps with larger 3 1/2 inch pulley at idle.
CS144 puts out 90 amps with larger 3 1/2" pulley at idle.

I just bought a newly rebuilt CS144 still in the Delco box on Ebay for $50.
That and a 3 1/2" pulley seems the best fit and price to me.

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Old 10-31-2012, 05:01 PM   #3 (permalink)
happypunch
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why not just go this route: http://www.db-starter-alternator.com...5-140-amp.aspx

they also have the 3 wire versions. very inexpensive and i think JD has said he liked their stuff in the past. this is what i plan on doing in the future, a lot cheaper than a new cs144 but still gets decent power.

I have read on other sites people having to get creative with the cs144's by replacing pulleys to work on a vbelt set up and still end up getting a lot of slipping at higher loads/rpms
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Old 11-27-2012, 11:15 PM   #4 (permalink)
SuperDaveTX
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Yep, I am looking at DB electrical for a High Output alternator.
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Old 09-05-2013, 12:45 PM   #5 (permalink)
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Bookmarked.
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Old 12-08-2013, 11:39 AM   #6 (permalink)
RD Durham
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The stock alternator was the ACDelco 12si found in 55 amps, 78 amps, 85 amps, and 94 amps. Normally 78 amps is the most common I’ve found at auto parts stores and salvage yards, but the others can usually be ordered in by the parts person. Alternatives to the stock 12si would be a boosted 12si at 105 or 108 amps, which I normally won’t run as the ones I’ve used in the past have tended to burn out within a year or two. Other alternatives are an ACDelco 15si 70 amps & 105 amps, or ACDELCO 17si which can be found in amperage ratings from 108 to 120 amps. The 15si and 17si are slightly larger than the 12si alternator but will bolt onto the engine without any modification.

Another alternative is the ACDelco CS alternators, of these I’d recommend the CS130 or CS144. The CS130 can be found in 105 to 120 amps and the CS144 124 amps to 145 amps. You have to be selective in using a CS alternator as they came with different front halves depending on the application. They are all the same alternator but some have the adjusting and mounting ears at different locations or might have three ears versus two. It’s not hard to find one that has the mounting ear and adjustment ear opposite from each other on the front case half. Once you find one with the correct mounting/adjustment ears you can just swap the front case half in the future to a good alternator. The other issue with the CS alternators is that they do not have the correct plug for the wiring loom in a truck that came with an SI alternator. However, there are adapters to fix this. If you have an “idiot light” or voltmeter in your dash you use one type, if you have an in line resistor in your wiring loom you use the other style. It depends on whether your truck has a resistor/amp gauge in the wiring loom going to the alternator. The adapters come with a resistor or without a resistor, so you have to decide which to use. If your application uses a charging/alternator "idiot" light or a line wire resistor, you choose a non-resistor adapter (that is the adapter doesn't have a built in resistor). Otherwise you choose the resistor adapter. You can also use a resistor adapter even if you have an "idiot/charging" light or resistor wire, so long as the total resistance in the circuit is not less than 35 ohms and doesn't exceed 350 ohms in the “key on” hot wire that goes to the alternator.

Adapters:
Non-resistor adapters:
- AC Delco: 8077
- NAPA: ECHEC80

Resistor adapters:
- AC Delco: 8078
- NAPA: ECHEC82

The CS alternators were used on serpentine belts, but to use with a v-belt engine you just swap pulleys. The CS130 is roughly the same size as the 12si alternator, and the CS144 is the close in diameter to the 15si and 17s alternators.

The Delco CS style alternators also have some advantages over the 12si alternators as they are normally a quieter alternator to run producing less RF static. The CS alternator also has a better design for dissipating heat with two cooling fans, and it comes in much higher amperages up to 140amps in some cases. Downside is a CS alternator is a lot more expensive as a rebuilt unit and normally will sell from $90 to $130, while a SI unit will be $30 to $70 depending on amperage/manufacturer(rebuilder). Also a Delco SI alternator has to get up to around 7000 rpm on the alternator shaft to put out its maximum amperage. A Delco CS alternator has to get just under 4500 rpm on the alternator shaft when it reaches full amperage. Engine RPM may vary because of the alternator pulley diameter, the smaller the pulley the quicker the alternator can get up to maximum output, so trying to estimate what the engine RPM would be at full output will vary depending on application.
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Old 12-09-2013, 07:45 PM   #7 (permalink)
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theirs alot of numbers up there i want an easy off the shelf bolt on no modification higher than 78 amp witch one am i looking at?
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Old 12-09-2013, 07:50 PM   #8 (permalink)
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Quote:
Originally Posted by ASPHALTVICTORY View Post
theirs alot of numbers up there i want an easy off the shelf bolt on no modification higher than 78 amp witch one am i looking at?

I was gonna say check car-part, but they only list 78 amp as the highest one for the diesel. Gassers came with a 94 amp as an option, not sure if one would fit though.
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Last edited by legendman; 12-09-2013 at 07:50 PM.
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Old 12-09-2013, 08:33 PM   #9 (permalink)
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i went with this one DB Electrical - NEW CHEVY HIGH OUTPUT 105 AMP ALTERNATOR 3-WIRE 65-85 10SI 7127-105

easiest thing out there. direct swap, took 15 minutes. works with your current vbelts, 105 amp for $67 and free shipping. i got it in 3-4 days, plus jdemeris recommended them as a quality store.

I haven't had a single problem with mine and love it.
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Old 12-09-2013, 09:13 PM   #10 (permalink)
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Quote:
Originally Posted by legendman View Post
I was gonna say check car-part, but they only list 78 amp as the highest one for the diesel. Gassers came with a 94 amp as an option, not sure if one would fit though.
yea just enough for H.E.I. ignition

ive got 2 brand new battery's a 6 month old reman alternator brand new 2awg battery cable and new 8 gauge primary wire with a new fancy gates belt and still that wiper headlight fan combo is eating juice if i turn the fan off its normal.

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