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08-17-2025, 02:16 PM
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#1 |
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Registered User
Join Date: Mar 2020
Location: The Woodlands,Tx
Posts: 644
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ls alt output
Thinking of upgrading my stock factory alt . My LS1 is out of a 2002 Trans am. When I turn on my ac the vots drop to a level I am not comfortable, only at idle . once in motion all good. I think factory is 102. In that case I am looking for a 110 upgrade. Thoughts
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08-17-2025, 02:25 PM
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#2 |
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Senior Member
 
Join Date: Sep 2005
Location: Lewisville, Nc
Posts: 10,259
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Re: ls alt output
need to make sure that when ac comes on that he pcm bumps the rpms up likw 250 rpms and that will solve your low voltage issue
__________________
David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2015 toyota Tacoma Daily 2012 Subura outback 2000 Tahoe 5.3l 420k 1999 honda accord General manager for Marco's Carwash & lube |
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08-17-2025, 03:09 PM
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#3 |
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Registered User
Join Date: Mar 2020
Location: The Woodlands,Tx
Posts: 644
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Re: ls alt output
I am not smart enough to do that. My experience with taking my truck somewhere for repair has been horrible. It is running so well I hate to have someone tell me they can fix it and screw up things (as in the past) and never fix my problem. I remember when I installed my harness (oem rebuilt) there where 2 wires I didn't hook up that were marked TCC and Tach. What is the TCC? I know what the tach is,
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08-17-2025, 04:55 PM
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#4 |
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Registered User
Join Date: Jun 2015
Location: Carlos MN
Posts: 2,591
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Re: ls alt output
I may be totally off base but is the TCC Torque Converter Control connection? Controlled by the ECM TC lock up wise.
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08-17-2025, 06:40 PM
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#5 |
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Senior Member
 
Join Date: Nov 2013
Location: East Tennessee
Posts: 2,408
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Re: ls alt output
My LS1 is also out of a 2002 TransAm
I put a 140 amp alternator on it and I just a few days ago, bumped up the base idle settings by 75 RPMs That made a difference in the idle when the AC compressor kicks on. I'm looking at wiring it so the PCM will sense the compressor and bump it another 50-75 RPMs I'm not sure about voltage drop because I haven't actually monitored it on the scanner. I'll take a look next time I'm under the hood.
__________________
1967 C10 Step side 1968 C10 Step side 1970 Chevrolet K/5 Blazer ............. 
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08-17-2025, 06:55 PM
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#6 |
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Registered User
Join Date: Mar 2020
Location: The Woodlands,Tx
Posts: 644
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Re: ls alt output
Thanks for the TCC info. Everything in trans works great so I am not going to mess with it.
Keep me posted on how you plan on bumping up the pcm function. I look forward to following this update. Thanks |
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08-18-2025, 06:41 PM
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#7 | |
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Registered User
Join Date: Mar 2022
Location: Surrey BC
Posts: 1,397
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Re: ls alt output
Quote:
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08-18-2025, 08:28 PM
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#8 |
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Registered User
Join Date: Mar 2020
Location: The Woodlands,Tx
Posts: 644
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Re: ls alt output
Not a new problem. Been this way since I had my ac put into service.
I just avoid turning it on unless I am on the highway. The truck has no issues with charging with the lights on at idle. I may need to change out cooling fans as the ones in there Ipulled from some dodge suv I bought at pick your parts and they me just be drawing to many amps. |
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