Quote:
Originally Posted by george kujanski
I don't know if there is something peculiar about the '69 brackets, but I know that the 10SI and 12SI are drop in mechanically compared to the original 10DN, Hence the advantage of using the higher output 12SI units developed and tested by Delco.
Since the original cabling was designed to handle a max output alternator of 62A, perhaps even a smaller cable for cars originally equipped with the 37A alt, upgrading to a larger output cable is good advice when going to a 94A.
These alts actually sense and control the voltage at the battery, but a small output cable will cause a larger voltage drop between the alt output and the battery. The result is loads connected closer to the alt output will have a slightly higher voltage than the battery, and this effect is minimized when larger cables are used.
Also for this reason, when fans are installed, they should be operated thru a relay (as most probably are), the relay power connection should be at or near the alternator electrically. This removes the fan current from going thru the harness and fusible link, which was sized for the original alternator. The fan and relay circuit should also then be fused to handle the fan current.
George
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George,
Thanks for all of the information. I am sure there is no difference in the alternator brackets as far as what size alternator they take. I was not aware the 10SI and 12SI were made on the same platform as the 10DN. This is good stuff to know.
I can easily make a new heavier wire for the alternator. What size wire would you recommend upgrading to to be able to handle the higher amps?
The 12SI alternators I have found on Summit that are made by PowerMaster are actually rated at 100amps. Are these the same as the ones you are talking about that are rated 94 amps? I know you are talking about an AC Delco with a rating of 94 amps but I have not had any luck locating one on the internet.
Thanks again,
Dale