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View Full Version : Alternator and tach trouble...


jpaitala
03-19-2004, 09:25
My alternator just went out... (Battery light on all the time)
At the same time the tachometer stopped working. Are they "linked" to each other somehow?? Or are they both a individual problems.

Thanks.
Phil Holmen
03-19-2004, 09:42
Tach signal is received from alternator. Be sure the new alternaor has a 63mm pulley (I beleice) for proper calibration.
92gmc
03-19-2004, 19:02
Originally posted by Phil Holmen:
Tach signal is received from alternator. Be sure the new alternaor has a 63mm pulley (I beleice) for proper calibration. Is that measured at the grooves or overall diameter. I bought my truck with a newly replaced alternator and when I added a factory tach cluster, found the tach is 15% over.

Does anyone know the part number for the correct pulley ?

thanks
Beedee
03-20-2004, 11:34
My Alt went bad a month or so ago, took to the local auto elect shop, cost me around $35.00 to have the rectifier replaced, lot better then 300 for new.
damork
03-22-2004, 09:58
My 2nd rebuilt AC Delco alternator went bad last winter so I replaced it with an Autozone Duralast Gold series. It has been great and keeps the voltage meter no less than 14 constantly - much better than any of the AC units in my experience.

I was considering an Iceberg unit from alternatorparts.com, but from the looks of it I wouldn't have been able to do a 15 minute parking lot swap. The Iceberg unit has large cooling fins you need to make bracket changes for.
cruzer
03-22-2004, 11:02
62mm where the belt rides. Approx 2.44". Ck out part # in the members section I think it's listed there.
Bobbie Martin
03-22-2004, 16:13
I was considering an Iceberg unit from alternatorparts.com, but from the looks of it I wouldn't have been able to do a 15 minute parking lot swap. The Iceberg unit has large cooling fins you need to make bracket changes for. [/QB]Yes, you have to modify the rear mount for the iceburg fins. You can see how I did it HERE. (http://home.bellsouth.net/p/s/community.dll?ep=87&subpageid=24530&ck=)
92gmc
03-22-2004, 19:23
Originally posted by cruzer:
62mm where the belt rides. Approx 2.44". Ck out part # in the members section I think it's listed there. thanks, I found the pn there
Brad Hemus
03-29-2005, 20:44
Originally posted by Phil Holmen:
Tach signal is received from alternator. Be sure the new alternaor has a 63mm pulley (I beleice) for proper calibration.
Brad Hemus
03-29-2005, 20:47
Originally posted by Phil Holmen:
Tach signal is received from alternator. Be sure the new alternaor has a 63mm pulley (I beleice) for proper calibration. Thanks for this info. My tach went out today, and it appeared that the alternator wasn't charging. I called the local dealer, and he tried to tell me it was likely the instrument cluster. He had no idea why the tach would have quit with a bad alternator!
arrowheadracing
03-30-2005, 03:27
Could you list the part #. I cant get into the memebers section for some reason. And I ve asked this question before as well. But since its been so cold, I havent gotten out to measure the alt pulley , but I thought my tach was off as well. Plus my volt is always 12-14, I thought it would be a little higher. But looks like thats the normal reading.
fastcat800
03-30-2005, 09:13
John indicated that the #24-1250 pulley represents the factory alternator pulley diameter for all 6.5 diesels. They show the diameter measured at the top of the "V" grooves for the belt, not the OD of the pully. This would make the 24-1250 a 62mm (2 7/16") dia. pully. My RPM now correctly reads 2050 at 65 MPH.