1 wire alternator ?'s - The 1947 - Present Chevrolet & GMC Truck Message Board Network

67 C-10 LWB · 04-01-2003, 01:58 AM

I bought a 100 amp Proform 1 wire alternator from jegs when I rebuilt my engine about 2 yrs ago.
too hook it up I just took the wire to the battery and hooked it up to the alternator output post, I left all the other wires unhooked, and w/ with the external regulator I just unplugged it, didn't do the jumping of terminals like I've seen here.
The question I have is this, when I first fired it up it was fine, it kick to full charge around 1200-1500 rpm like they are supposed to do. lately, and this is since like last fall i would say it won't kick on till about 3K rpm when it's cold, but once it "excites" that one time it will come on around 1200 or so, any ideas? is it because I didn't bypass the old external regulator, or is the alternator going bad? any help would be great, thanks

Ean

JimKshortstep4x4 · 04-01-2003, 09:32 AM

It is the alternator itself. You have it hooked up correctly.

The other style of alternator with internal regualtion needs the jumper wiring but your one-wire does not.

Jim

mikep · 04-01-2003, 10:06 AM

My one wire does the same thing. I just got used to sticking it in neutral and gassing it till the ammeter moves to the right while I drive to work in the morning.

67 C-10 LWB · 04-01-2003, 03:11 PM

thanks for the replies guys

so is the alternator going bad since I have to put it up to 3000 rpm for it to "kick on" the first time essentially?
or is that just how these one wires are?
maybe I should I just break down and get an old style external regulator?

Ean

mikep · 04-01-2003, 08:18 PM

Thats just the way they are. Don't worry about it.

67 C-10 LWB · 04-01-2003, 08:22 PM

Cool
Thanks very much

Longhorn Man · 04-02-2003, 12:46 AM

I makes me wonder why you have to go to 3k now, when you were only reving it to 1200 - 1500 RPM when it was new.
Double check your belt condition and tightness.

67 C-10 LWB · 04-02-2003, 01:07 AM

my belt is new and nice and tight.
it might not be quite 3K rpm's, buts close, around 2600-2800 for sure
I don't know, guess I could take it off and have it tested.

ZOOMY · 04-09-2003, 04:03 AM

It sounds to me like your alternator is half-waveing. When 1 diode in the bridge opens, you have to spin it faster to get substantial output. Take it off & have it checked at a parts store where they check them for nothing........Zoomy

04-01-2003, 01:58 AM	#1
67 C-10 LWB Registered User Join Date: Nov 2000 Location: Bay City, MI, USA Posts: 452	1 wire alternator ?'s I bought a 100 amp Proform 1 wire alternator from jegs when I rebuilt my engine about 2 yrs ago. too hook it up I just took the wire to the battery and hooked it up to the alternator output post, I left all the other wires unhooked, and w/ with the external regulator I just unplugged it, didn't do the jumping of terminals like I've seen here. The question I have is this, when I first fired it up it was fine, it kick to full charge around 1200-1500 rpm like they are supposed to do. lately, and this is since like last fall i would say it won't kick on till about 3K rpm when it's cold, but once it "excites" that one time it will come on around 1200 or so, any ideas? is it because I didn't bypass the old external regulator, or is the alternator going bad? any help would be great, thanks Ean __________________ 1999 Silverado Ext Cab Short Box Z71 2006 Trailblazer (wifes) 2 '04 KFX400's My Site

04-01-2003, 10:06 AM	#3
mikep Used to have a truck Join Date: May 2002 Location: port orchard WA Posts: 1,552	My one wire does the same thing. I just got used to sticking it in neutral and gassing it till the ammeter moves to the right while I drive to work in the morning. __________________ No truck :-(

04-01-2003, 03:11 PM	#4
67 C-10 LWB Registered User Join Date: Nov 2000 Location: Bay City, MI, USA Posts: 452	thanks for the replies guys so is the alternator going bad since I have to put it up to 3000 rpm for it to "kick on" the first time essentially? or is that just how these one wires are? maybe I should I just break down and get an old style external regulator? Ean __________________ 1999 Silverado Ext Cab Short Box Z71 2006 Trailblazer (wifes) 2 '04 KFX400's My Site

04-01-2003, 08:18 PM	#5
mikep Used to have a truck Join Date: May 2002 Location: port orchard WA Posts: 1,552	Thats just the way they are. Don't worry about it. __________________ No truck :-(

04-01-2003, 08:22 PM	#6
67 C-10 LWB Registered User Join Date: Nov 2000 Location: Bay City, MI, USA Posts: 452	Cool Thanks very much __________________ 1999 Silverado Ext Cab Short Box Z71 2006 Trailblazer (wifes) 2 '04 KFX400's My Site

04-01-2003, 09:32 AM	#2
JimKshortstep4x4 Senior Member Join Date: Jul 2001 Location: Muskegon,MI,USA Posts: 6,026	It is the alternator itself. You have it hooked up correctly. The other style of alternator with internal regualtion needs the jumper wiring but your one-wire does not. Jim

04-02-2003, 12:46 AM	#7
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	I makes me wonder why you have to go to 3k now, when you were only reving it to 1200 - 1500 RPM when it was new. Double check your belt condition and tightness.

04-02-2003, 01:07 AM	#8
67 C-10 LWB Registered User Join Date: Nov 2000 Location: Bay City, MI, USA Posts: 452	my belt is new and nice and tight. it might not be quite 3K rpm's, buts close, around 2600-2800 for sure I don't know, guess I could take it off and have it tested. __________________ 1999 Silverado Ext Cab Short Box Z71 2006 Trailblazer (wifes) 2 '04 KFX400's My Site

04-09-2003, 04:03 AM	#9
ZOOMY Senior Member Join Date: Feb 2003 Location: WIS Posts: 1,752	rpm It sounds to me like your alternator is half-waveing. When 1 diode in the bridge opens, you have to spin it faster to get substantial output. Take it off & have it checked at a parts store where they check them for nothing........Zoomy



Register or Log In To remove these advertisements.

Register or Log In To remove these advertisements.