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70 cutlass convertible 455 with A/C clutch fan.
New Autowire harness (internal regulator alternator wiring)
After searching through the many alternator posts on this forum of various ages.
Trying to verify if this info is correct/still current or if there are new/ better options.
Normally CS130 would be the choice but since I have the new autowire harness.
The 10SI or 12SI would be the choice.
Looks like the 10si has a threaded hole. looks closer to the original and costs more.
The 12SI I imagine would just need a nut to replace the threaded hole. (fan style cools better?)
So the questions are:
Are there any clocking issues?
Is this info current and correct?
Any reason to go with a higher amperage?
What size of stereo AMP or other accessories would require more amperage?
I have a Powermaster 200a 10si, and it works great. I don't know the exact formula for figuring out alternator size; I'm sure the satellite guy will know. The bigger the windings, the bigger the horsepower drain, however they don't run at 100% all the time. Either way, the kit probably provides 10ga charge wire that's barely sufficient for 100a alternator. I recommend 8 or 4ga. Also, make sure you ground the case or have your block to frame ground very close to it with the same size wire or bigger.
I find the high amperage 10SI alternators don't last long term, glad there are exceptions. Most aftermarket alternators are 10SI, even if they claim to be 12SI. The difference is the bigger fan and more open back to help cool the extra amperage produced. I run a 4 gauge wire directly to the battery terminal when running higher amperage alternators. Good luck.
Last edited by olds 307 and 403; March 1st, 2023 at 05:05 AM.
The easy answer is to use either the 12SI from a 1987 Olds Custom Cruiser with 307 (95 amp) or the CS130 from a 1989 Custom Cruiser (105 amp). Either one is available from RockAuto. Either one bolts directly in place of a 10DN on an older Olds. The 12SI is $72 plus core, the CS130 is $75 without core. You can get a conversion harness that plugs into a 12SI harness connector and mates to the CS130 so you don't have to cut the new harness.
February 28th, 2023, 09:03 PM
