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: 1,022	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 1999 Chevy k1500 Suburban 5.7L auto 4x4 2002 Chevy s10 4.3L auto 4x4 1971 Mercury Monterey wagon 400 auto Plus other misc. ... 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: 3,716	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: 1,182	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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