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Old 12-26-2007, 09:50 AM   #1
Biggwaukegan
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Default Upgrading the Alternator....

Guys I hope this doesnt sound to stupid, but my 97 Tahoe came with the 105 amp alternator, I believe. Can I and what should I upgrade it to? I was thinking at least 125 or maybe upwards of 200. Any suggestions and any recommendations on brands? Are the top of the line alternators at Autozone any good? thanks guys
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Old 12-26-2007, 10:35 AM   #2
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as long as they are reman and not rebuilt. not sure if 200 amps exists, but there are higher units than the 105 u have.
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Old 12-26-2007, 01:50 PM   #3
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Bigger Alternator cant be bad for the tahoe can it? I mean it leaves me room for toys if I so want right?
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Old 12-26-2007, 03:19 PM   #4
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correct. extra amps i not a bad thing. is your current alt on the outs? or do you just want to upgrade.
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Old 12-26-2007, 05:58 PM   #5
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the best mods i did to my truck were an optima yellow top battery and a duralast EXTREME alternator, the guy at auto zone said that it was 200 amps but he may have been wrong, he broke it down like this- duralast was 130 amps duralast gold was 150 amps and duralast extreme was 200 amps, i did this as i plan to add some major off road lighting in the near future.
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Old 12-27-2007, 11:54 AM   #6
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Havent had a problem with the alternator yet...But I dont want one either. It looks about 2 years or so old so Im changing it with a higher amp..Think I will get a 150 if available. I can also see that the Optima battery will be a close second after I get the alternator. :smilielol:
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Old 06-12-2018, 07:07 PM   #7
Surprise Tahoe
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Default 140 amp alternator

Was wondering when upgrading to a 140 amp alternator is there anything I should be aware of? Wiring etc.....
Thanks
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Old 06-13-2018, 09:15 AM   #8
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Any time you upgrade the charging system, you need to upgrade the wiring to handle additional amps. The local electric shop had a 225A alternator in stock that fit my Yukon, and I upgraded the charging wire and added a 200A fuse. The fuse protects from loose wires and high amperage circuits creating arcs just in case.

The wire gauge is determined by the length of the wire, and voltage/amperage going across it. I used 6 gauge for my charging wire as I won't ever pull that many amps, and needed to upgrade for the electric fan conversion I did.

See the chart here: http://assets.bluesea.com/files/reso...on_chartlg.jpg

Associated article: https://www.bluesea.com/support/arti...r_a_DC_Circuit
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