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72gmcshorty · 12-20-2003, 11:17 PM

Mine also does this. I had purchased an alternator rebuild kit and replaced the diode thingy and brushes but not the bearing that goes on the shaft. I wonder if that could have been the problem? Is it a brand new alt or newly rebuilt?

Cat Fuzz · 12-20-2003, 11:49 PM

It's a new rebuilt. Not very old at all.

Rooster's 67 · 12-28-2003, 03:59 AM

cat fuzz......did you find the problem?

71-longbed · 12-28-2003, 05:45 AM

ive got a similar problem ..my headlights dont dim at idle but my heater fan slows down alittle when i stop and idle ..and then the fan revs back up to full speed once i start moving again

dwaite72lnghrn · 12-28-2003, 09:51 AM

The fan slowing down at idle sounds like a going bad battery. It should hold the volts/current at idle, Then when the rpms go up the alternater should pickup and charge the system. Amp meter checks the charging system Volt meter checks the battery condition.
The original post sounds like a bad diode in the internal regulator.

12-20-2003, 11:17 PM	#26
72gmcshorty Registered User Join Date: Jul 2001 Location: North Delta, British Columbia Posts: 1,344	Mine also does this. I had purchased an alternator rebuild kit and replaced the diode thingy and brushes but not the bearing that goes on the shaft. I wonder if that could have been the problem? Is it a brand new alt or newly rebuilt? __________________ 1992 Gmc 2wd 1972 Chevy Blazer 2wd

12-28-2003, 03:59 AM	#28
Rooster's 67 Registered User Join Date: Sep 2003 Location: DFW Posts: 765	cat fuzz......did you find the problem? __________________ The problem with America is stupidity. I'm not saying there should be a capital punishment for stupidity, but why don't we just take the safety labels off of everything and let the problem solve itself?

12-28-2003, 05:45 AM	#29
71-longbed Its Magically Delicious Join Date: Jan 2003 Location: oregon Posts: 2,398	ive got a similar problem ..my headlights dont dim at idle but my heater fan slows down alittle when i stop and idle ..and then the fan revs back up to full speed once i start moving again __________________ 71 C10 LWB 350sbc -TH350 12 bolt 3.42 Posi Of all my favorite things to do, The utmost is to have a brew. My love grows for my foamy friend, with each thirst-quenching elbow bend. Beer so frosty, smooth, and cold it's paradise pure liquid gold. Yes beer means many things to me that's all for now cus I gotta pee.

12-28-2003, 09:51 AM	#30
dwaite72lnghrn Registered User Join Date: Jun 2002 Location: central pa Posts: 1,525	The fan slowing down at idle sounds like a going bad battery. It should hold the volts/current at idle, Then when the rpms go up the alternater should pickup and charge the system. Amp meter checks the charging system Volt meter checks the battery condition. The original post sounds like a bad diode in the internal regulator. __________________ 72 longhorn c30 502BB/th400/fact air/4.11rear/ custom camper 72 bug(the better half's) under reconstruction 2009 HHR aqua blue 71 GMC k20 350/sm465 2009 Chevy hd3500 6.6 Victory Red crew cab dually Dave & Jeanne

12-20-2003, 11:49 PM	#27
Cat Fuzz My son, my joy. Join Date: Sep 2003 Location: Spokane WA Posts: 463	It's a new rebuilt. Not very old at all.



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