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I found that the electric fans I installed really crushed the voltage levels with the original 10DN type alternator. After some investigation I determined the simplest solution was to upgrade to a CS-130 style internally regulated alternator and after a fair amount of looking around I found this unit that was originally specified for a 1988 Chevy Caprice Wagon with the Olds 307 engine:



http://www.oreillyauto.com/site/c/detail/ULT0/010381.oap?year=1988&make=Chevrolet&model=Caprice&vi=1037089&ck=Search_01468_1037089_2538&pt=01468&ppt=C0330

I installed it yesterday in a few minutes using this harness (Delco DN to CS - Part # W315CS):



http://www.qualitypowerauto.com/catalog.php?item=81

It took just a few minutes to remove the old alternator, find a bolt to replace the original upper bolt due to the new alternator having no threads in the small ear and installing the wiring harness adapters (they provide a jumper for the Voltage Regulator connector that jumps two contacts; you can also jump these inside the case to maintain a stock look if desired). The result is rock solid voltage at any engine speed with or without the fans cranking. I highly recommend this upgrade for all situations as it is just a much better unit that provides better voltage at low engine speeds while providing 105 amps.

Great info, especially that you included part #'s. Thanks for posting.

It is a good, inexpensive and simple upgrade that significantly improves the electrical system.

You can even keep the stock look by shorting the internal contacts in the regulator.