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Click on image for the lowdown. 
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| | | Forums66 Topics128,089 Posts1,056,356 Members48,442 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
| | THANKS!
For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | Joined: Jan 2019 Posts: 2,242 Herder of Cats, Goats, and Sheep (moderator) | | Herder of Cats, Goats, and Sheep (moderator) Joined: Jan 2019 Posts: 2,242 | Be aware that a decent number of the lower current 10-SI designs will not charge at idle RPMs.
I went through several of them before upgrading to a 105A on my 58. The higher current alternators start charging at lower speeds.
Depending on what your electrical load and normal driving habits, that might or might not be an issue for you. I ran into issues with the electric fan running down the battery when stuck in traffic for extended periods. | | |
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