New battery and new alternator-DEAD - The 1947 - Present Chevrolet & GMC Truck Message Board Network

GTS61 · 02-04-2019, 03:39 PM

I have a 1961 GMC pickup with a 305 V6. I installed a new battery and a new alternator. Started it up and watched my volt gauge go from 12 to 0. Anyone have any idea’s why this would happen? Thanks a lot!!

**straight6chevyguy** · 02-04-2019, 05:03 PM

Are you using the original style voltage regulator or are you using a newer alternator with an internal regulator?

**The Rocknrod** · 02-04-2019, 06:02 PM

I once installed an internal regulated alternator in a truck that used an external regulated alternator. It worked. Until I got to the 1st car show I ever went to and there I was stuck.

Yep, ya live and learn. Of course this was way before the internet.

GTS61 · 02-04-2019, 08:00 PM

Hahahaha! I’m using internal one. I just found the problem. A exposed wire was grounding out everything but thanks for replying.

forestb · 02-05-2019, 06:15 PM

Sorry to hijack this thread but do I need to run a ground if I have an internally regulated one wire alternator?

vince1 · 02-06-2019, 04:39 AM

I think you want continuity from the alternator case to the battery negative. Probably you already have that through various grounds.

02-04-2019, 03:39 PM	#1
GTS61 Registered User Join Date: Mar 2015 Location: Jacksonville, Florida Posts: 66	New battery and new alternator-DEAD I have a 1961 GMC pickup with a 305 V6. I installed a new battery and a new alternator. Started it up and watched my volt gauge go from 12 to 0. Anyone have any idea’s why this would happen? Thanks a lot!!

02-04-2019, 05:03 PM	#2
straight6chevyguy Senior Member Join Date: Dec 2018 Location: yamhill OR Posts: 910	Re: New battery and new alternator-DEAD Are you using the original style voltage regulator or are you using a newer alternator with an internal regulator? __________________ 1965 chevy c20 292 4speed http://67-72chevytrucks.com/vboard/s...d.php?t=777601 1976 chevy c10 250 4speed http://www.67-72chevytrucks.com/vboa...d.php?t=787037 1978 chevy c20 350 4speed 1998 chevy c1500 4.3L 5speed 2002 Chevy s10 4.3L auto 4x4 Plus a Mercury & some Fords... To many projects!

02-04-2019, 06:02 PM	#3
The Rocknrod Moderator Join Date: Aug 2011 Location: China Spring, TX Posts: 7,280	Re: New battery and new alternator-DEAD I once installed an internal regulated alternator in a truck that used an external regulated alternator. It worked. Until I got to the 1st car show I ever went to and there I was stuck. Yep, ya live and learn. Of course this was way before the internet. __________________ Master Chief, US Navy, Retired 1964 C10 Step-side Short Bed - In Progress 2009 2500HD Duramax LTZ 1948 GMC Panel 1956 Big Window Stepside 1953 5 Window Chevy Stepside 1932 Coupe New Seat Foam for Bench Seats?

02-04-2019, 08:00 PM	#4
GTS61 Registered User Join Date: Mar 2015 Location: Jacksonville, Florida Posts: 66	Re: New battery and new alternator-DEAD Hahahaha! I’m using internal one. I just found the problem. A exposed wire was grounding out everything but thanks for replying.

02-05-2019, 06:15 PM	#5
forestb Registered User Join Date: Jan 2009 Location: Burbank, CA Posts: 3,619	Re: New battery and new alternator-DEAD Sorry to hijack this thread but do I need to run a ground if I have an internally regulated one wire alternator?

02-06-2019, 04:39 AM	#6
vince1 Registered User Join Date: Jan 2013 Location: Calgary Alberta Posts: 1,170	Re: New battery and new alternator-DEAD I think you want continuity from the alternator case to the battery negative. Probably you already have that through various grounds.



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