Alternator options

[1985olds]

Good evening everyone,

I have an ls3 mounted in my g body. It currently has a g8 style 2 pin alternator. I want to switch to a 4 pin style. Problem is I cannot find one that fits the mount and clears my motor mounts. My engine is shoved pretty far back. I tried a c6 alternator and it hangs too far off the back and hits the motor mount. I am trying to stay away from the ls1 style to keep my amperage up. Does anyone have any ideas of alternators that would fit the ls3 style bracket, be the 4 pin style connector and have a compact case? Thank you.

[Vimes]

Something like this (https://www.mechman.com/alternators/engine-swap-ls-coyote-hellcat/ls-truck-suv/170-amp-high-output-racing-alternator-for-gm-truck-ls-brackets/) fit the bill? I've had good luck with Mechman, used them on 2 different pickups over the last few years and they're still going strong.

[1985olds]

Something like this (https://www.mechman.com/alternators/engine-swap-ls-coyote-hellcat/ls-truck-suv/170-amp-high-output-racing-alternator-for-gm-truck-ls-brackets/) fit the bill? I've had good luck with Mechman, used them on 2 different pickups over the last few years and they're still going strong.

Hmmmm, I dont know if it will. Do the truck alternators fit ls3 brackets?

[andrewb70]

Hmmmm, I dont know if it will. Do the truck alternators fit ls3 brackets?

Saying "ls3 brackets" is a little confusing. Do you mean Corvette style brackets? Accessories are chassis dependent, not engine dependent. So which accessories do you have, exactly?

Andrew

[67-LS1]

What about this?

https://brand-x-electrical.myshopify.com/products/14-8v-internal-regulator-gm-pcm-bypass-with-plug

There is a detailed YouTube on how it’s done here..

https://youtu.be/LAlPMteyWaI

[Vimes]

Hmmmm, I dont know if it will. Do the truck alternators fit ls3 brackets?

No idea. My post was more about recommending Mechman as a supplier than a specific offering of theirs. They make alternators for pretty much all makes and models. The alternators I bought from them made more amperage at idle than the factory alt made period, and fit in the factory location. If the alternator you want to use came on a GM from the factory, they probably make a high amperage version of it.

[67-LS1]

The problem with the two pin may not be higher output as much as it is voltage control. The two pins tells me the alt is controlled by the ECM/BCM and is PWM.
That’s the issue I have and my alternator has a VERY specific case. Two years of V6 Camaro only. So I’m going to go the route of swapping out the VR. It may or may not work for the OP.

[Vimes]

Hmmmm, I dont know if it will. Do the truck alternators fit ls3 brackets?

No idea. My post was more about recommending Mechman as a supplier than a specific offering of theirs. They make alternators for pretty much all makes and models. The alternators I bought from them made more amperage at idle than the factory alt made period, and fit in the factory location. If the alternator you want to use came on a GM from the factory, they probably make a high amperage version of it.

[Sinnister69]

[QUOTE=67-LS1;1355001]What about this?

https://brand-x-electrical.myshopify.com/products/14-8v-internal-regulator-gm-pcm-bypass-with-plug

This is what I did. Very very simple
I too could not find a 4 pin alternator that fit my holley mid mount water pump without having to spend the outrageous $450 for what it seems to me the only 4 pin alternator that fits that mount lol

all you need to do is either use a small saw blde like the ones that are used on the mini air saws or you can use a soldering iron to melt the terminal after that its a matter of just unbolting the 2 pin regulator and bolting in the 4 pin regulator and you can either crimp or solder on the terminal

i had to trim some of the plastic on the plug shroud to accomodate the wider 4 pin regulator plug

heres where i got mine
https://customelectricservice.com/collections/alternators/products/denso-type-gm-14-8v-set-point-regulator-for-pcm-bypass-or-replacement

[1985olds]

Sorry for the confusion about the bracket style. The brackets are from a 2009 g8 with the l76. I think I found a solution. The G8 has the same belt spacing as an ls3 c6. So I'm thinking of using a c6 bracket which moves everything a little higher, which (in theory) solves the alternator running into the motor mount and the c6 ps pulley hitting my power steering hose.