almost a huge mistake

Gonna switch the d14 over to an alternator since the genny had crapped out.  a friend had 2 alternators in his garage that needed rebuilt one off a 1979 firebird and another from a 69 buick gsx.  I only needed them to figure out the brackets so no big deal they needed rebuilt.  firebird alt. was to big, the gsx was perfect! spent the rest of the day fiddling with the brackets to get every thing lined up. the next morning decided to price a alt. online. to my surprise it was only 50 bucks, good, checked the specs. it has an external voltage regulator!!!!! all that work for nothing!!!  luckily between me and the fella at the parts store we found a alt from a 1985 celebrity 4cylinder was the same size as the one from the gsx.

moral of the story, check to make sure it's the part you want before spending all day making brackets!!!!

You didn't waste your time if you used a "DN" series Alternator for mock up. Its basically the same configuration as its "SI" cousin even it it was clocked a little differently. The cases and the mounting is basically the same. The wiring of coarse is different being a external VR is used with a "DN" series vs the internal regulated "SI" cousin.
Steve@B&B


Edited by Steve in NJ - 28 May 2017 at 6:15am

On an old tractor where the wiring is shot I install a one wire alternator run it to the
where the battery cable hooks to the starter solenoid.Then add a wire off the same connection to run to the ignition and back the starter post on the solenoid and lights if I want lights.I put in a fuse or breaker
between the alternator and the solenoid and another one off the wire going to the the other electrical stuff.

I just put a CS130 on my 7000 after my 10si got a little flaky on me last year. Everything mounted right up, only thing is the tach feed reads about 10-15% lower for some reason? But it's nice not having the alternator light coming on faintly with the stadium lights and a/c going!
Hurst

pulley was a different size, I took the pulley off the generator and put it on the alternator

When you say "tach feed measures", what do you mean? Are you driving the tach off the P terminal of the alternator? The voltage shouldn't matter much here. The tach should be reading the frequency. The frequency would be the same no matter which alternator, providing the same sized pulley was used.

I imagine the cs130 has a different frequency than the 10si. I would still recommend it for the low rpm amps. I'll have to keep you updated on reliability. This is the first season.

Hurst

It's probably closer to 15%. WOT high idle reads about 2200-2300 instead of a little over 2500 rpms.

Hurst

Thanks for the help! I'll look into it! I wonder if the niehoff alternators used a smaller pulley that would correct the reading?

Hurst

If you have a 2 inch pulley on the alternator now, switching to a 1.75 inch pulley should just about bring it to where you want it.