The 1947 - Present Chevrolet & GMC Truck Message Board Network







Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > 47 - Current classic GM Trucks > The 1967 - 1972 Chevrolet & GMC Pickups Message Board

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 06-29-2009, 10:21 PM   #1
nac593
Registered User
 
Join Date: Sep 2007
Location: san diego,ca
Posts: 125
what should voltage be WHILE CRANKING?

So if the battery shows 12v when truck is off, what should it be while cranking?
nac593 is offline   Reply With Quote
Old 06-29-2009, 11:27 PM   #2
Longhorn Man
its all about the +6 inches
 
Longhorn Man's Avatar
 
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
Re: what should voltage be WHILE CRANKING?

I don't like seeing it drop below ten, but the reality of it is... it can go low, as long as it starts, and it has enough amps to roll over at a decent pace.
Longhorn Man is offline   Reply With Quote
Old 06-29-2009, 11:53 PM   #3
QKENUF4U
Senior Member
 
QKENUF4U's Avatar
 
Join Date: Jan 2005
Location: SUNNY WARM BIKE RIDING COTTONWOOD ARIZONA
Posts: 2,097
Re: what should voltage be WHILE CRANKING?

10.5 is usually the limit and i personally wouldnt want it going much lower.
QKENUF4U is offline   Reply With Quote
Old 06-30-2009, 05:44 AM   #4
jim zag
ENGINE BUILDER
 
jim zag's Avatar
 
Join Date: Apr 2006
Location: Shortsville n.y.
Posts: 344
Re: what should voltage be WHILE CRANKING?

Crank it for 15 seconds and voltage should not go below 9.6.
__________________
JIM ZAG
jim zag is offline   Reply With Quote
Old 06-30-2009, 06:47 AM   #5
Andy4639
Old member
 
Andy4639's Avatar
 
Join Date: Jan 2002
Location: Liberty, & Garden City S.C. , U.S.
Posts: 19,945
Re: what should voltage be WHILE CRANKING?

If you have a TPI unit they say it needs to stay above 11 volts to crank. I know you have to cut the factory coil wire out and replace it with straight wire. The factory has a resistants built into it to drop the voltage.
__________________
1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver
Seeing the USA in a 71


Upstate SC GM Truck Club
2013,14 and 2016 Hot Rod Pour Tour


http://upstategmtrucks.com/



Get out and drive the truck this summer and have some fun!
It sucks not being able to hear!

LWB trucks rule, if you don't think so measure your SWB!
After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs.
Andy4639 is offline   Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 10:43 PM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright 1997-2022 67-72chevytrucks.com