C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

alternator question

Old Jun 29, 2017 | 08:42 PM
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Default alternator question

hey everyone

As it looks like my alternator may be the source of my problems, I was wondering what people have gone to that have replaced their alternator - some say 10 or 12si? I think the '85 had a 17si - I really did not want to get into modifications to make an alternator fit if I can help it but I did see some nice 140amp units - from Tuff Stuff and powermaster - if those are good brands. No local places seem to have anything in stock or parts to replace - so I think I am stuck ordering regardless

any suggestions or experience with any of these ?

thanks very much

Sean
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Old Jun 29, 2017 | 09:08 PM
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Get a Powermaster from Jegs or Summit, and be done with it.
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Old Jun 29, 2017 | 09:30 PM
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Originally Posted by sb66
hey everyone

As it looks like my alternator may be the source of my problems, I was wondering what people have gone to that have replaced their alternator - some say 10 or 12si? I think the '85 had a 17si - I really did not want to get into modifications to make an alternator fit if I can help it but I did see some nice 140amp units - from Tuff Stuff and powermaster - if those are good brands. No local places seem to have anything in stock or parts to replace - so I think I am stuck ordering regardless

any suggestions or experience with any of these ?

thanks very much

Sean
1985 alternators are 17si configuration. three assemblies were used during the production model year.

1985 production - p/n 1105585 (120 amp), 1105450 (108 amp), 10479868 (120 amp)

personally, i'd go with a service replacement 120 amp, however, these things are fairly simple to rebuild.

if you want to go with a straight plug and play, try this - http://www.rockauto.com/en/moreinfo....041208&jsn=481

after the core return, around $60 from rockauto.

Last edited by Joe C; Jun 29, 2017 at 09:31 PM.
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