High output alternator

[RawbDidIt]

I think I've seen it. It's under another high output alternator info request that either went nowhere, or the OP didn't tell us what happened....

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[Kran]

most if not all GM alts for a 4.3 through 7.4 from early 90s to late 2010s i believe are interchangeable.

here's my alt setup. dual 370a

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[83GMCK2500]

The higher output alternator is the CS-144 alternator commonly found on 454s and SUVs with heated leather seats, has a different plug on it from the smaller frame CS-130. See my notes, with part numbers, on post #124 in the alternator upgrade thread.

96-98 Vortec Alternator Upgrade AD244

 

[Robeard]

Looks good. I got a “Tuff stuff” 8206ND 175Amp alternator from summit for my ‘99 5.7l powered Tahoe. But it was DOA. I did a warranty exchange and the second replacement is also DOA. I’ve never had such bad luck with an alternator replacement. While 150A isn’t that high it’s better than the 0A Tuff stuff. I’ll consider the power master for this upgrade once I work out the refund situation. Thanks for the post!

 

[tinfoil_hat]

The 140 amp unit I got from Autozone would not fit. Same bolt pattern and plug connector but it was too big around to sit in the bracket properly.

 

[DallasTahoe]

This is the alternator I got from autozone, 145amp fit perfectly, just need the pigtail

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[Joe Dirte]

Did the NBS alt on my 98. Tested perfect at store but only put out bout 12 volts when running. Gonna get another for my 96 soon cuz I'm doin LS swap in 98 but I'll definitely do the big 3 or 5 upgrades in both as they have small stereos and hids with 4hi mods.

 

[ME TOO 2]

Definitely do the big 3, I used 0 gauge for all my power and ground especially since I’m running dual batteries


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Tell me please!
What is the Big 3 Upgrade?

 

[RawbDidIt]

Did the NBS alt on my 98. Tested perfect at store but only put out bout 12 volts when running. Gonna get another for my 96 soon cuz I'm doin LS swap in 98 but I'll definitely do the big 3 or 5 upgrades in both as they have small stereos and hids with 4hi mods.

How are you testing the output voltage? Check with a multimeter from the positive of the alternator to the alternator case. You may have some gnarly voltage drop from the alternator to the gauge in the dash. If that's the case, then you'll need to upgrade your wiring from engine and body ground to battery negative, and power wire from alternator and power distribution box to positive battery. If you're still low, connect a wire from the sending connector in the pigtail to the distribution box feed. You can check coverage drop across each wire but if you're going to do the big three anyway, that should take out the voltage drop... well mostly anyway, there's always going to be a slight voltage drop across any wire.

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[RawbDidIt]

Tell me please!
What is the Big 3 Upgrade?

Big three is a commonly used reference to upgrading stock wiring. Power wire from alternator to battery, power wire from battery to distribution box in engine, ground wire from engine block to ground, ground wire from body to ground, and for kicks you can also upgrade your ground from the alternator case to the negative battery terminal.

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