HELP with Alternator/charging system question... - The 1947 - Present Chevrolet & GMC Truck Message Board Network

LOHRTBT · 11-11-2002, 01:51 PM

Is there anything that would keep the electrical system from charging properly?
other than the alternator, or battery?

Yes my voltage reg is in the alt... Getting mine rebuilt, in the mean time, the one that O'Reilly gave me will not charge the battery...it just runs down...we checked it with another battery to eliminate the possibility of bad batt. and the voltage is not where it should be...about 12.4 volts and when lights are turned on, down to 11 and more with the stereo...it never recovers even when the gas pedal is depressed.

We even took it back off and had them test the rebuilt unit..it tested fine...unless its just the wrong one for my truck... I dunno. Getting my chrome one rebuilt today and having it turned into a 100AMP instead of 60 so hopfully i can avoid the dead alt again in the future.

Could the 25volts the bad alt was pushing through the system for about 10 miles have damaged anything else to keep the system from working properly??? Thanks and sorry for the book but I wanted to include everything.

Oh yeah.... it did melt down the fuseable link wire that is off the firewall out of the wire harness...I replaced that too.
p.s..its a 1 wire alt. just like my chrome one.
Dave

Txstruck · 11-11-2002, 01:56 PM

Im not totally positive but some alt have a feedback wire that tells the alt to start charging when the batt volt level gets down to a certain level. Maybe it is bad or burnt.

bigblock73 · 11-11-2002, 01:58 PM

loose or slipping belts will cause a charging system to not work properly.

LOHRTBT · 11-11-2002, 02:06 PM

nOPE AND NOPE. HEHEHE
We bypassed the only wire on the alt..still no change in voltage at all. And the belt is tight....every time of the 3 we had it on/off !! lol
Keep em coming....
Im tellin you we spent 5 hours thinking and trying other stuff...eliminated all possible things..well. we thought so anyhow..> I still think the alt they gave me is not functioning properly.

Guess I will find out when I get my old one back. Damn!! $80 to rebuild it or $240 for a new one! DOh!

Keep the ideas coming...maybe we will hit on something I missed.

ocbaud · 11-11-2002, 02:27 PM

to bad it wasnt just a belt like we thougth

bigblock73 · 11-11-2002, 02:35 PM

stick your tongue on the positive battery terminal...if that doesn't work maybe it'll straighten dem toes out?

LOHRTBT · 11-11-2002, 02:38 PM

Quote:

Originally posted by bigblock73
stick your tongue on the positive battery terminal...if that doesn't work maybe it'll straighten dem toes out?

ROFLMAO~~!!!

:p

ElGracho · 11-11-2002, 02:41 PM

Quote:

Originally posted by LOHRTBT
[B]nOPE AND NOPE. HEHEHE
We bypassed the only wire on the alt..still no change in voltage at all.

What does this mean? My first thought was that the second alternator isn't really a 1 wire design. If you need one before you get your original back, I would go get a stock one from the wrecking yard for $10 and wire it like stock to at least make the thing charge.

I'm pretty sure all you need is a wire that is on with the ignition to excite the field of the alternator and then the wire that goes to the postive post of the battery (usually via a connection at the starter).

Sounds like the second one wire alternator is shot.

LOHRTBT · 11-11-2002, 02:45 PM

Same thing we thought...they tested it after we put it on and took it back off/.tested fine....

We bypasssed the wire as a test to see if it would work..still no change.

**swervin ervin** · 11-11-2002, 07:57 PM

Dave,

I would try and help but I'm the worlds worst when it comes to electrical stuff.

Only thing I can think of is the second alt is not working right. Just guessing with everyone else.

bigd65 · 11-11-2002, 09:21 PM

HAHAGHAHHAAHAHAHAH dave them toes must really be CrOkEd , everyone is always harassing you about them. i am DAMN sure glad i dont hafta see them HAHAHAHAHHAHAHAHAHA

11-11-2002, 01:51 PM	#1
LOHRTBT BeWarE tHe eViL CrAnkTOe! Join Date: Oct 2002 Location: Yukon, OK Posts: 3,605	HELP with Alternator/charging system question... Is there anything that would keep the electrical system from charging properly? other than the alternator, or battery? Yes my voltage reg is in the alt... Getting mine rebuilt, in the mean time, the one that O'Reilly gave me will not charge the battery...it just runs down...we checked it with another battery to eliminate the possibility of bad batt. and the voltage is not where it should be...about 12.4 volts and when lights are turned on, down to 11 and more with the stereo...it never recovers even when the gas pedal is depressed. We even took it back off and had them test the rebuilt unit..it tested fine...unless its just the wrong one for my truck... I dunno. Getting my chrome one rebuilt today and having it turned into a 100AMP instead of 60 so hopfully i can avoid the dead alt again in the future. Could the 25volts the bad alt was pushing through the system for about 10 miles have damaged anything else to keep the system from working properly??? Thanks and sorry for the book but I wanted to include everything. Oh yeah.... it did melt down the fuseable link wire that is off the firewall out of the wire harness...I replaced that too. p.s..its a 1 wire alt. just like my chrome one. Dave __________________ ~Dave~ You can call me Mike, Mike Oxlong - 1986 Chevy SWB - Stock for now - *1986 Chevy Custom SWB* *Stolen 6/26/05* - 1985 Chevy SWB SOLD - 1999 T/A Some mods www.cardomain.com/id/ramairdave AIM Screenname - Jester84

11-11-2002, 01:56 PM	#2
Txstruck Registered User Join Date: Nov 2002 Location: Dallas Posts: 459	Im not totally positive but some alt have a feedback wire that tells the alt to start charging when the batt volt level gets down to a certain level. Maybe it is bad or burnt. __________________ Steve 86 K30 4x4 6.2L Diesel\TH400\NP208 - 14bolt FF rear w/detroit locker and Dana60 front w/detroit locker- both with 4.56 gears "Runs on Mud"

11-11-2002, 02:45 PM	#9
LOHRTBT BeWarE tHe eViL CrAnkTOe! Join Date: Oct 2002 Location: Yukon, OK Posts: 3,605	Same thing we thought...they tested it after we put it on and took it back off/.tested fine.... We bypasssed the wire as a test to see if it would work..still no change. __________________ ~Dave~ You can call me Mike, Mike Oxlong - 1986 Chevy SWB - Stock for now - *1986 Chevy Custom SWB* *Stolen 6/26/05* - 1985 Chevy SWB SOLD - 1999 T/A Some mods www.cardomain.com/id/ramairdave AIM Screenname - Jester84

11-11-2002, 07:57 PM	#10
swervin ervin You get what you pay for Join Date: Dec 1999 Location: Cherryville, NC Posts: 4,798	Dave, I would try and help but I'm the worlds worst when it comes to electrical stuff. Only thing I can think of is the second alt is not working right. Just guessing with everyone else. __________________ Mike 1985 Chevy C-10

11-11-2002, 09:21 PM	#11
bigd65 Registered User Join Date: Mar 2000 Location: Clute, TX. Posts: 1,935	HAHAGHAHHAAHAHAHAH dave them toes must really be CrOkEd , everyone is always harassing you about them. i am DAMN sure glad i dont hafta see them HAHAHAHAHHAHAHAHAHA __________________ 2004 Silverado Crewcab 1972 Chevy Monte Carlo 2017 Chevy Tahoe

11-11-2002, 01:58 PM	#3
bigblock73 yeller Join Date: Oct 2001 Location: Twin Cities Posts: 13,824	loose or slipping belts will cause a charging system to not work properly.

11-11-2002, 02:06 PM	#4
LOHRTBT BeWarE tHe eViL CrAnkTOe! Join Date: Oct 2002 Location: Yukon, OK Posts: 3,605	nOPE AND NOPE. HEHEHE We bypassed the only wire on the alt..still no change in voltage at all. And the belt is tight....every time of the 3 we had it on/off !! lol Keep em coming.... Im tellin you we spent 5 hours thinking and trying other stuff...eliminated all possible things..well. we thought so anyhow..> I still think the alt they gave me is not functioning properly. Guess I will find out when I get my old one back. Damn!! $80 to rebuild it or $240 for a new one! DOh! Keep the ideas coming...maybe we will hit on something I missed.

11-11-2002, 02:27 PM	#5
ocbaud Garage Queen Material Join Date: Oct 2002 Location: USA Posts: 4,129	to bad it wasnt just a belt like we thougth

11-11-2002, 02:35 PM	#6
bigblock73 yeller Join Date: Oct 2001 Location: Twin Cities Posts: 13,824	stick your tongue on the positive battery terminal...if that doesn't work maybe it'll straighten dem toes out?



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