The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post

Andy4639 · 11-18-2020, 12:42 PM

Remember a alternator is not meant to charge up a dead battery. That is the worst thing you can do with it. If your battery is dead charge it with a charger. I know if your stranded you can't but I'm talking about when you do it at home. Put it on the charger. Let it fully charge before you test it. If it wasn't fully charged when you tested the battery out then that's why.

From your response you have a straight drive so the RPM @ idle is a little lower than a auto. Don't know for sure what model you have but a 67-72 C-10 straight drive stock motor is about 650-700 @ idle. If you have a different cam then it would be something else. When warm.

11-18-2020, 12:42 PM	#6
Andy4639 Old member Join Date: Jan 2002 Location: Liberty, & Garden City S.C. , U.S. Posts: 19,936	Re: Idle too low low to charge Remember a alternator is not meant to charge up a dead battery. That is the worst thing you can do with it. If your battery is dead charge it with a charger. I know if your stranded you can't but I'm talking about when you do it at home. Put it on the charger. Let it fully charge before you test it. If it wasn't fully charged when you tested the battery out then that's why. From your response you have a straight drive so the RPM @ idle is a little lower than a auto. Don't know for sure what model you have but a 67-72 C-10 straight drive stock motor is about 650-700 @ idle. If you have a different cam then it would be something else. When warm. __________________ 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.