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70 Amp Alt for an 86-87

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Old 05-25-08, 06:25 PM
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70 Amp Alt for an 86-87

Just figured I'd let everyone know that Advanced Auto actually sells a 70Amp direct replacement for 65Amp alternators of the 86-87.5 Rx7's. I know it's not an FD 100Amp, but it's still nice for those that do not have the time to redo their harnesses.
Old 05-25-08, 07:32 PM
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Any GM 180 Degree bolt hole alternator with an internal regulator will work as well. You will have to modify your V-belt pulley to fit in most cases. I used a 140 Amp out of a 1993 Oldsmobile once.


Just thought I'd add that.
Old 05-26-08, 10:38 AM
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Originally Posted by lax-rotor
Just figured I'd let everyone know that Advanced Auto actually sells a 70Amp direct replacement for 65Amp alternators of the 86-87.5 Rx7's. I know it's not an FD 100Amp, but it's still nice for those that do not have the time to redo their harnesses.
They make a 70 amp alt, because that is what came from the factory on that car.

All S4 models, had a 70 amp alt, while S5 models had a 80 amp alt.

65 amp alts were only on the 84-85 models.

If you notice in the 86 and 87 brochures (both found in the what did my car come with sticky thread at the top of this section) that under electrical, a 70 amp alternator is clearly called for and described.


Old 05-30-08, 07:38 PM
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Originally Posted by Alak
Any GM 180 Degree bolt hole alternator with an internal regulator will work as well. You will have to modify your V-belt pulley to fit in most cases. I used a 140 Amp out of a 1993 Oldsmobile once.


Just thought I'd add that.
Good to know. Do you need to alter the wiring harness at all?
Originally Posted by Icemark
They make a 70 amp alt, because that is what came from the factory on that car.

All S4 models, had a 70 amp alt, while S5 models had a 80 amp alt.

65 amp alts were only on the 84-85 models.

If you notice in the 86 and 87 brochures (both found in the what did my car come with sticky thread at the top of this section) that under electrical, a 70 amp alternator is clearly called for and described.


Oh my fault Icemark. I was under the impression it was 65. They do sell two versions for the 86-87.5 though. One is 65 amps, the other 70.
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