Getting + Voltage On The Neg. Terminal - The 1947 - Present Chevrolet & GMC Truck Message Board Network

69 Short Fleet · 08-05-2004, 05:45 PM

I got my battery charged up and its at 13.2 volts. I hooked up the pos. side only and checked for voltage between the neg. battery terminal and the end of the neg. battery cable and I'm getting 11.2 volts right away and then it quickly drops to about 5.8 volts and holds there. I pulled all the fuses (one at a time) and kept checking and it is still the same? I tried disconnecting everything I could think of horn relay, horn, emergency flasher, signal flasher and still the same. Can someone steer me in another direction, I don't get this at all..... Thanks Doug (key is in off position and everything is shut off)

franko72 · 08-05-2004, 06:55 PM

check cables for good grounds and condition of wires(green and corroded)

**john** · 08-05-2004, 06:58 PM

You could disconnect the alternator to rule out a bad diode, glove box light?
good luck john

Tx Firefighter · 08-05-2004, 10:43 PM

digital radio?

69 Short Fleet · 08-06-2004, 12:31 AM

-Franko72, I have checked all grounds (and even added a few) unless I'm overlooking something. All shiny metal to shiny metal.

- John, Good point on the Alt. I'll try that (my 2nd new alt.) & no glove box light

- Tx Firefighter, I have no radio

Thanks for all your help & thoughts though, Doug

69 Short Fleet · 08-06-2004, 02:13 AM

Hang on here, I started to think some more on this (actually I have not stopped, lol). I had my horn relay connector disconnected?!?!? I thought hmmmmm, there is a really large red wire going in and a large green wire going out of this thing and I'm thinking that there must be a main power splice running through it. The wires are too large for it to be horn related only (their like 8 or 10 Ga.) Is this how the thing is designed? Its too late tonight to start the truck up but I'll be under the hood first thing tommorow, Doug

08-05-2004, 05:45 PM	#1
69 Short Fleet Registered User Join Date: Nov 2002 Location: Kelowna B.C. Canada Posts: 1,086	Getting + Voltage On The Neg. Terminal I got my battery charged up and its at 13.2 volts. I hooked up the pos. side only and checked for voltage between the neg. battery terminal and the end of the neg. battery cable and I'm getting 11.2 volts right away and then it quickly drops to about 5.8 volts and holds there. I pulled all the fuses (one at a time) and kept checking and it is still the same? I tried disconnecting everything I could think of horn relay, horn, emergency flasher, signal flasher and still the same. Can someone steer me in another direction, I don't get this at all..... Thanks Doug (key is in off position and everything is shut off)

08-05-2004, 06:55 PM	#2
franko72 Franko72 Join Date: May 2004 Location: Cincinnati,Ohio Posts: 471	check cables for good grounds and condition of wires(green and corroded) __________________ 1972 C20 cheyenne Super 402 BB/400 turbo LWB A/C Tilt, Cruise Control, Saddle tanks, Tach My Home Page Better to burn out than it is to rust

08-05-2004, 06:58 PM	#3
john member #16 Join Date: Dec 1999 Location: Yuba City Ca. Posts: 3,618	You could disconnect the alternator to rule out a bad diode, glove box light? good luck john __________________ john http://67-72chevytrucks.com/vboard/showgroups.php board vendors http://www.flickr.com/photos/1745471...7602865984234/

08-05-2004, 10:43 PM	#4
Tx Firefighter Watch out for your cornhole ! Join Date: Jun 2003 Location: Azle, Texas Posts: 14,162	digital radio? __________________ I'm on the Instagram- @Gearhead_Kevin

08-06-2004, 12:31 AM	#5
69 Short Fleet Registered User Join Date: Nov 2002 Location: Kelowna B.C. Canada Posts: 1,086	-Franko72, I have checked all grounds (and even added a few) unless I'm overlooking something. All shiny metal to shiny metal. - John, Good point on the Alt. I'll try that (my 2nd new alt.) & no glove box light - Tx Firefighter, I have no radio Thanks for all your help & thoughts though, Doug

08-06-2004, 02:13 AM	#6
69 Short Fleet Registered User Join Date: Nov 2002 Location: Kelowna B.C. Canada Posts: 1,086	Hang on here, I started to think some more on this (actually I have not stopped, lol). I had my horn relay connector disconnected?!?!? I thought hmmmmm, there is a really large red wire going in and a large green wire going out of this thing and I'm thinking that there must be a main power splice running through it. The wires are too large for it to be horn related only (their like 8 or 10 Ga.) Is this how the thing is designed? Its too late tonight to start the truck up but I'll be under the hood first thing tommorow, Doug



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