L83 (1500 with current sensor) biggest OEM alternator

[Vuk]

I'd like to hear about OEM-style alternator upgrades for the L83, I have a 2016 Sierra 1500 with current sensor. I assume that dual alternators cannot be fit into the factory wiring since there's no way to "split" alternator control wires into two?

 

Edit: I have 23487089 (150 Amp), and I think the 170 Amp one is 22949467. Is there anything bigger that will just plug in and work?

 

Every experience is appreciated. Thanks a lot!

Edited January 5, 2020 by Vuk

[Vuk]

With help from member doubeleive, I am finding that 84143541 220 Amp alternator works without problems. I think that will be enough for my needs right now.

Edited January 8, 2020 by Vuk

[rbrjr1]

awesome information

 

[Vuk]

There is a small catch - the factory line from the alternator is fused with 175A on the power distribution block (on top of the main battery). Most likely I will just get a 250A inline fuse and move over that wire three lugs down directly to the power bus. Also, making that wire thicker gauge is probably a good idea to support full charging current.

Edited January 6, 2020 by Vuk

[Vuk]

I just ordered Littelfuse 298900, which holds one MEGA type fuse (same as the fuses used in previous generation power distribution blocks, and also this generation on the aux battery positive terminal). There are many options to fuse this lead; I just went with this one because I don't like needing to have multiple types of spare fuses and this vehicle already has too many different ones (I already have these exact 250A fuses for my inverter). 250A fuse part # is MEG250XP.

 

Note: this is not one of those in-line fuse housings that hang with the wire but rather has mounting points for two bolts.

Edited January 6, 2020 by Vuk

[dank1]

So how is this working out?     I want to do this as well but i am a little confused.  Couple vs decoupled ?  I understand the difference, but which do i have?  Also the part # 84143541 is listed for an 18 while part # 84143539 is listed for the 16.

[Vuk]

I've never seen the different pulley types but I haven't seen many of these trucks' engines either. Best I can do is attach my photos of part numbers I was referring to above.

 

150Amp mounted:

 

220Amp out of the box:

 

150Amp and 220Amp side by side:

 

 

By the way, the 220Amp alternator has been working well for me for months now.

[Vuk]

There seems to be a new offering of aftermarket 250/320/400Amp alternators for this generation of trucks from Mechman:

 

https://www.mechman.com/alternators/gmc/sierra/5-3l/2014-2018/

 

Also, there seem to be 250/320/370/400Amp versions from JS Alternators that are to be used with the factory ECU-controlled voltage:

 

https://js-alternators.com/products/2005-2019-gmc-sierra-1500-5-3l-250-320-370-400amp-high-output-alternator

 

Has anyone had experience with these?

Edited January 17, 2024 by Vuk

[MikeBMW]

Yes, I installed a Mechman 250amp alternator with no issues.
Just plug and play.
https://www.mechman.com/alternators/cadillac/cts-ctsv/6-2l/2016-2019/250-amp-high-output-alternator-for-gm-truck-14-22/

[mikeyk101]

16 hours ago, MikeBMW said:

Yes, I installed a Mechman 250amp alternator with no issues.

It says for 6.2 but will it work for 5.3 as well?

[MikeBMW]

In my experience, yes.
Not sure where it says it's only for a 6.2, though?

[mikeyk101]

1 hour ago, MikeBMW said:

In my experience, yes.
Not sure where it says it's only for a 6.2, though?

I looked at the link and it showed for the 6.2 Cadillac motor. Thanks for confirming.

Edited February 27, 2024 by mikeyk101