Charging system info needed - The 1947 - Present Chevrolet & GMC Truck Message Board Network

mvpco · 04-06-2005, 03:58 PM

HI All!

My charging sytem is not working right.

1972 Chevy C-10 350, auto I put new alt, voltage reg.(solid state) I check voltage at Terminal 2 and it is 12 volt and bat volt at battery connection is 12volt what should voltage at terminal @1 be on Alt???

any other ideas?
Generator light stays on at idle, but when I rev it up it goes out????

Jeff Smith
Pensacola, FL

dubie · 04-06-2005, 04:21 PM

could be your battery? When the truck is running and you have a voltmeter on the right battery trminals, you should be pulling over 14 Volts at idle. If it's about half that, then your battery is screwed. I had this happen last fall on mine, ended up being a DUD battery. Usually when one part of your charging system starts to go, the rest will follow.

mvpco · 04-06-2005, 07:12 PM

I also put a new battery in and forgot to mention, thanks
I found a old post about it at:
http://207.44.196.117/vboard/showthread.php3?t=119379

great info all around

lots of great info, this board is better than the old military jeep board I use www.g503.com

Jeff Smith
Pensacola, FL
mvpco@yahoo.com

BobbyK · 04-06-2005, 08:49 PM

Term 1 is the voltage sense line.
NO voltage should be present.

This terminal tells the alt to start chargeing.

It's take's a "sense" of the voltage being used by the electrical system and tells the alt to either produce more or less voltage via the internal voltage regulator.

aesj2 · 04-06-2005, 09:40 PM

Check the fuses under the hood, along the fenders near the front. These are in black holders. They are used for the charging system. I think they are 5a and are used for the gauge circuit.

BobbyK · 04-07-2005, 02:34 AM

Those are for the Amp gauge only.
Even if both those fuses are blown the charging system will still work.

mvpco · 04-07-2005, 08:08 AM

I did it, no problems, WOW!

Great info

Jeff
Pensacola

BobbyK · 04-07-2005, 12:22 PM

I mistakenly stated that term #1 "sense's" voltage.I'm sorry but that would be terminal #2.

Term. #1 only "turns on" the alt. and tells it to start charging.It also can operate the "ALT/charger" idiot light if don't have the gauge inst. cluster.

Sorry for the misinformation.

04-06-2005, 07:12 PM	#3
mvpco Registered User Join Date: Apr 2005 Location: Pensacola, FL Posts: 400	Charging System I also put a new battery in and forgot to mention, thanks I found a old post about it at: http://207.44.196.117/vboard/showthread.php3?t=119379 great info all around lots of great info, this board is better than the old military jeep board I use www.g503.com Jeff Smith Pensacola, FL mvpco@yahoo.com

04-06-2005, 08:49 PM	#4
BobbyK Registered User Join Date: May 2000 Location: Petrolia,Ontario,Canada but working in Port Huron,Mi. Posts: 1,771	Term 1 is the voltage sense line. NO voltage should be present. This terminal tells the alt to start chargeing. It's take's a "sense" of the voltage being used by the electrical system and tells the alt to either produce more or less voltage via the internal voltage regulator. __________________ 71 blazer,350SBC,approx.375HP,700R4,factory GM TPI.Dual electric fans,33x12.5x15 ATR on stock suspension. Petrolia,Ontario,Canada but working in Port Huron,MI. See ALL my Blazer pic's HERE

04-07-2005, 02:34 AM	#6
BobbyK Registered User Join Date: May 2000 Location: Petrolia,Ontario,Canada but working in Port Huron,Mi. Posts: 1,771	Those are for the Amp gauge only. Even if both those fuses are blown the charging system will still work. __________________ 71 blazer,350SBC,approx.375HP,700R4,factory GM TPI.Dual electric fans,33x12.5x15 ATR on stock suspension. Petrolia,Ontario,Canada but working in Port Huron,MI. See ALL my Blazer pic's HERE

04-07-2005, 08:08 AM	#7
mvpco Registered User Join Date: Apr 2005 Location: Pensacola, FL Posts: 400	Charging System I did it, no problems, WOW! Great info Jeff Pensacola

04-07-2005, 12:22 PM	#8
BobbyK Registered User Join Date: May 2000 Location: Petrolia,Ontario,Canada but working in Port Huron,Mi. Posts: 1,771	I mistakenly stated that term #1 "sense's" voltage.I'm sorry but that would be terminal #2. Term. #1 only "turns on" the alt. and tells it to start charging.It also can operate the "ALT/charger" idiot light if don't have the gauge inst. cluster. Sorry for the misinformation. __________________ 71 blazer,350SBC,approx.375HP,700R4,factory GM TPI.Dual electric fans,33x12.5x15 ATR on stock suspension. Petrolia,Ontario,Canada but working in Port Huron,MI. See ALL my Blazer pic's HERE

04-06-2005, 03:58 PM	#1
mvpco Registered User Join Date: Apr 2005 Location: Pensacola, FL Posts: 400	Charging system info needed HI All! My charging sytem is not working right. 1972 Chevy C-10 350, auto I put new alt, voltage reg.(solid state) I check voltage at Terminal 2 and it is 12 volt and bat volt at battery connection is 12volt what should voltage at terminal @1 be on Alt??? any other ideas? Generator light stays on at idle, but when I rev it up it goes out???? Jeff Smith Pensacola, FL

04-06-2005, 04:21 PM	#2
dubie Registered User Join Date: May 2000 Location: Flin Flon, Manitoba, Canada Posts: 8,855	could be your battery? When the truck is running and you have a voltmeter on the right battery trminals, you should be pulling over 14 Volts at idle. If it's about half that, then your battery is screwed. I had this happen last fall on mine, ended up being a DUD battery. Usually when one part of your charging system starts to go, the rest will follow. __________________ My name's Tim and I'm a truckaholic My 56 Chevy shop truck build http://67-72chevytrucks.com/vboard/s...d.php?t=562795

04-06-2005, 09:40 PM	#5
aesj2 Registered User Join Date: Feb 2002 Location: Ferndale, Michigan, USA Posts: 94	Check the fuses under the hood, along the fenders near the front. These are in black holders. They are used for the charging system. I think they are 5a and are used for the gauge circuit.



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